I think they just simply spent a lot more time on the PCE version. Think about it, they had to make a 16-bit game work right for a 8-bit system with 16-bit color. Also, it probably helped that the PCE was already being maxed out in those days. It wasn't until 95-96 when the SNES and Genesis did some really amazing stuff with the help of more experience and higher meg counts.
Another missing thing is the girl to the left of the jet intake in Guiles stage. Also, the Vegas girls are bouncy on the PCE but not SNES and even more bouncy on the arcade. I have an eye for that after being a KOF fan for years.
I actually think that Capcom did a
half-assed job compared to the standard of their SNES ports. Sure it turned out great, but it should've been a lot better.
Around the time that the PCE version was near completion, Capcom showed off its Megadrive version of 'CE which would've been released around the same time. It was
definitely a rushed straight port. The color was awful, its was severly letterboxed, had smaller sprites and real slowdown. It showed that Capcom really
didn't care about its non-Nintendo games.
Luckily, the negative reaction and likely a mathematicion showing them what the Sega market was like
outside of Japan convinced them to go back to the drawing board at the last minute. The huge jump in quality of the 'Special Champion Edition" really impressed me when it finally came out. Especially Guile's stage.
I've been dying to find a rom of some footage of that original Megadrive SFIICE port, but the closest I've ever come is
of the second attempt that resembles the final version more. It does seem to have different music than the final version and some FM sfx though.
Capcom never made any other PCE games before or after and it was only a contract job that NEC
hired them to do. Plus, as it was being developed the mags reported how NEC wanted the game out asap, to bask in exclusivity before the other versions got released. Because at that point, the only other home version was SNES WW.
At the
very least they music should've been programmed/performed like some of the better HuCard soundtracks, the black bar behind the HP bars is unnecessary and it wouldn't be hard to do at least
some layered bgs/scrolling. One of the good NEC Ave teams could've done a much better job.
If Capcom had at least made as many games for PCE as Konami did and was publishing them
themselves, I think that the game would be a lot different(
especially if it was a port of the arcade instead of the SNES WW).