Is the firewall on a 67 Cutlass or 442 the same firewall as other 67 A body GM cars Chevelle, Tempest, Skylark?

 

evidently not.but the cowl sides,and floorpans are why they are different i don't know.

 

I have a 66 buick parked next to a 67 cutlass and they look the same to me Have a 66 F85 also that looks the same. I can tell for sure that that passenger side of the firewall where the air conditioning is located, is the same.

 

Here is a 66
https://classicoldsmobile.com/forums...-442-cowl.html