Fender Tag Screws

...although your larger screw doesn't look like correct proportions to me.

Hmmm

All that I have seen, including into the late 1980's are the same size and the heads are taller than "common" screws.

The Phillips "slots" do take up a lot of the head, like the small screw in your pics.


My vote-

Your small screw is original.

Large screw is a replacement.