Board Thread:Questions and Answers/@comment-15835234-20160810003412/@comment-679780-20161012160637

Myself 123 wrote: It's somewhat ambiguous, but I believe that the redesigns are just that. Even though Generations showed the designs together. Sonic 4 Ep II showed just Modern Metal Sonic in the aftermath of his race. There is quite a few things about Sonic 4 that bother me. Bothers I'm quite sure common to most of us here. It would make sense if Mad Gear Zone upgraded Classic Metal Sonic to Modern Metal Sonic.

Some have told me there is no physical difference between the Metal Sonics but I believe there is.