One difference between the 70’s and today is the diversity of facial hair in the public. It wasn’t like all baseball players had moustaches, but it seems like there were a lot more than today.
Darrell Porter looked like a clean cut ball player on this 1975 Topps card. And then transitioned into a handlebar moustache tough looking guy. If Topps Porter ran into SSPC Porter in a bar, I don’t think he’d want to start any trouble with himself.