They will fit but the trim and materials may not match
They will, but outside moldings will be different and interior door panels will differ as well
No, they're 2 totally different bodystyles
if same year the frame of door will be same. but door pannel isn't same. you can make it work
No
yes it will. any camaro door 82-92 should fit
no its two different frontends
Yes
YES.
yes they do
Check the Firebird and Camaro seats.
Yes
Yes. The firebird and camaro use the same chassis. Use mounts and headers for a camaro, and you'll be all set.