Wait, hold on.... Luigi's sprites were different in the SMAS + SMW and just plain SMAS cartridges?! (Didn't know that...) Anyway, if this is true, I'll have to compare my "common" cart with my friend's "rare" cart. I think he has a whole bunch of rare SNES stuff and doesn't know it...
Don't mean to derail, but while looking up how rare some games were that I was interested in purchasing, I decided to consult my old friend, this list:
http://snescentral.edgeemu.com/lists/snes_rarity_list.txtNote that SMAS+SMW gets a "D" for rarity, making it less common than SMAS, but not rare.
However, I notice that plenty of games I own are on the higher end of the scale that surprise me.
Kirby Super Star has a B.
Rex Ronan: Experimental Surgeon is an A- (okay, I never expected that one to be common).
Top Gear 3000... B. So rarity... WHATEVER.