Well, I don't think I have any notes but I should be able to do this from memory.
First Pic: Area A: the distance from the bottom of the panel to the body line under the bumper is longer on the Camaro panel. If I remember right it was 3/8" to 1/2" more.
Area B: the end of the Camaro body line turns up in the last 2-3 inches. My original(?) had too much filler in those areas to tell what it was supposed look like, but it didn't appear to turn up like that.
Area C: Has a bumper (or ?) mounting plate on the back side with a single hole through the panel there. Easy to remove and weld up the hole.
Other: Is the obvious area around the license plate. Not at all like the Firebird.

You can see from the other pics where I sectioned the panel and used the outer parts of the lower valance.