Someone from a TG-16 oriented forum I frequent put up a massive comparison last year. It compares the Street Fighter II'/CE/Turbo ports for Super NES/Famicom, Genesis/Mega Drive, and PC Engine/TG-16 (no official US release). There are copious pictures, some videos, and descriptions. He uses Japanese system logos, so be on your guard. Also, in a few places he used the "HE" logo for the PC Engine. The order is usually fixed PCE/SFC/MD, but sometimes he breaks that order and uses a different one, so look for logos/labels to be sure you know which pics are from which systems.
This is a comparison only suitable for the real nuts, like me

So if you've a burning interest, dig in!
http://www.superpcenginegrafx.com/sfiic ... _main.html