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I have the game The Firemen for the SFC. There was also a version released in EUR in English. I know it is possible to take the PAL rom and put it on a NTSC cart, but will it run properly?
I can't tell. Most likelely gameplay speed won't be adapted, but few comercial games actually adapted it anyway. Sound speed will be allright because the SPC timers are identical on NTSC and PAL, but however some sound effects may get out of synch with the CPU and things like that. Most likely nothing catastrophic will happen, but some modern Nintendo games have security implemented. As long as the game wasn't developped by the big N you should be fine.