Until I saw this image, I was under the impression that there were essentially three types of Apple 1s.

Now there is photographic evidence of a possible preproduction board with several differences from known production units.

http://techland.time.com/2012/11/22/behold-some-of-the-first-apple-computer-photos-ever/

This unit uses the large orange caps like Woz’s hand wired prototype. In additional to that, upon close examination, this board’s layout appears to differ somewhat from the known production boards.