I woke up this morning looking at these two SMW carts.
Felt like a hangover movie when I realized they were different!
SNS-MW-USA-1 and SNS-MW-USA. Did a bit of reading and supposely there is also -2 and -3. There is always something to collect out there 
According to my original manual, the copy that came packed in with the SNES (the All-Star and World bundle that came in separate carts) was SNS-MW-USA-3. Sadly, I sort of traded that copy with a friend, and the copy I have now is SNS-MW-USA-1, so I check to see what's different. But I can confirm that -3 did exist.
