Biohazard 1.5 era 3 is special to me because the first scans I saw of 1.5 was that era.
Here is the differences I see between this era and (psm) vanilla era. I only took the backgrounds which I saw difference even if there were slightly.
Left era 3 and Right era 4 (vanilla 40%)
Click on the pic to see it enlarged
Backgrounds
Judging from the screenshot its seems this era only had 7 rooms.
Lobby

Angle which is inactive in 40% (era 4) was active in era 3. The background looked slightly different

Office A

Shutter

Office B

Extra angle which isnt present in 40% (era 4)

Firing Range

Weapon Storage
Angle which is inactive in 40% (era 4) was active in era 3

Chiefs Office

Models and enemy placement
Elza and Leon didnt have animation like in BH Rebirth holding gun "ready to fire" but era 3 had more like BH 1 animation holding arms down.
Elza
Artwork with era 3 clothes on left and era 4 clothes on right.

Elza model in era 3 had lower quality and slighty different clothes, no gloves and much shorter ponytail.
Left era 3, middle (elza getting eatin) still era 3 judging by german shepherds but with updated elza model which almost look like 40% one only without gloves and maybe no ponytail. Right era 4 (vanilla 40%)

Leon
Leons model in era 3 looked almost the same as in 40% but only without gloves.
Left era 3 and Right era 4 (vanilla 40%).

Zombies
Zombies seem to have same model/skin as in the 40 % version but their placement for different models are in different room.
Lobby: 2 civilian zombies, 2 cop zombies, 2 fat blonde zombies which makes 6 in total. This era probably didnt include zombies breaking in the lobby, enemies just were in the room.
Office A: 2 cop zombies, 3 fat black zombies which make 5 in total.
Shutter: 2 civilian zombies behind the shutter as in 40% era.
Office B: 2 cop zombies, 2 fat blonde zombies and 1 fat black zombie which makes 5 in total.
Firing Range: Zombies are not present.
Weapon Storage: Zombies are not present.
Chiefs Office: 3 cops zombies, 1 fat black zombie which makes 4 in total.
Cerberus/K9
Dogs in this era were german shepherds instead dobermans.
Lower left era 3, upper left updated era 3 with new elza model (gloveless and maybe without ponytail because it is not visable on the pic) and german shepherds seems to be updated and it seems their ribs is not visable anymore (if i am correct). Right era 4 (vanilla 40%)

Lobby: K9 not present.
Office A: K9 not present.
Shutter: K9 not present.
Office B: K9 not present.
Firing Range:1 K9 dog.
Weapon Storage: 3 K9 dogs. I believe they were in placement from the beginning.
Chiefs Office: K9 not present.
I was judging enemy placement by screenshots doesnt mean its 100 % accurate.
If someone could mod 1.5 vanilla build to look like era 3 that would be awesome. To bad I suck with modding
Here is the differences I see between this era and (psm) vanilla era. I only took the backgrounds which I saw difference even if there were slightly.
Left era 3 and Right era 4 (vanilla 40%)
Click on the pic to see it enlarged

Backgrounds
Judging from the screenshot its seems this era only had 7 rooms.
Lobby
Angle which is inactive in 40% (era 4) was active in era 3. The background looked slightly different
Office A
Shutter
Office B
Extra angle which isnt present in 40% (era 4)
Firing Range
Weapon Storage
Angle which is inactive in 40% (era 4) was active in era 3
Chiefs Office
Models and enemy placement
Elza and Leon didnt have animation like in BH Rebirth holding gun "ready to fire" but era 3 had more like BH 1 animation holding arms down.
Elza
Artwork with era 3 clothes on left and era 4 clothes on right.
Elza model in era 3 had lower quality and slighty different clothes, no gloves and much shorter ponytail.
Left era 3, middle (elza getting eatin) still era 3 judging by german shepherds but with updated elza model which almost look like 40% one only without gloves and maybe no ponytail. Right era 4 (vanilla 40%)
Leon
Leons model in era 3 looked almost the same as in 40% but only without gloves.
Left era 3 and Right era 4 (vanilla 40%).
Zombies
Zombies seem to have same model/skin as in the 40 % version but their placement for different models are in different room.
Lobby: 2 civilian zombies, 2 cop zombies, 2 fat blonde zombies which makes 6 in total. This era probably didnt include zombies breaking in the lobby, enemies just were in the room.
Office A: 2 cop zombies, 3 fat black zombies which make 5 in total.
Shutter: 2 civilian zombies behind the shutter as in 40% era.
Office B: 2 cop zombies, 2 fat blonde zombies and 1 fat black zombie which makes 5 in total.
Firing Range: Zombies are not present.
Weapon Storage: Zombies are not present.
Chiefs Office: 3 cops zombies, 1 fat black zombie which makes 4 in total.
Cerberus/K9
Dogs in this era were german shepherds instead dobermans.
Lower left era 3, upper left updated era 3 with new elza model (gloveless and maybe without ponytail because it is not visable on the pic) and german shepherds seems to be updated and it seems their ribs is not visable anymore (if i am correct). Right era 4 (vanilla 40%)
Lobby: K9 not present.
Office A: K9 not present.
Shutter: K9 not present.
Office B: K9 not present.
Firing Range:1 K9 dog.
Weapon Storage: 3 K9 dogs. I believe they were in placement from the beginning.
Chiefs Office: K9 not present.
I was judging enemy placement by screenshots doesnt mean its 100 % accurate.
If someone could mod 1.5 vanilla build to look like era 3 that would be awesome. To bad I suck with modding

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