pclubys Puzzle Club (Yun Sung, set 1)
is a multi-game title with a 2-player spot the difference game in it..
deluxe5 Deluxe 5 (ver. 0107, 07/01/2000)
is another possibility (very similar to the above)
if you like that type of thing be sure to check out these non-multigame versions
magerror Magical Error wo Sagase
photoy2k Photo Y2K (ver. 105)
searchp2 Search Eye Plus V2.0 ('sequel' to the game in the Puzzle Club collection)
ssfindo See See Find Out (although performacne requirements are stupidly high on this one, and it has no sound)
and of course the Hidden Catch series perviously mentioned