The hi-res ones look better because they are 24-bit 640x480. The PC ones are 640x240 and use shitty MDEC/JPEG like compression at 16-bit. The sprites are even more gimped out - there are like 8 compression methods and all of them are either 4,8 or 16bit colour depth.
Compared to the PSX version PC data has twice the horizontal resolution in general. The ALIVE engine I'm working on will accept higher bit depth and higher res images. Also it reads both PSX and PC data so its easy to compare how they look side by side.
Edit: Also... my editor just scales any input image to 640x240, and the "Happy Oddidays" thing from JAW seems to use the original higher res sprites.
http://www.oddworldforums.net/showpo...3&postcount=51