Quote from presjpolk:
Did Super Mario Bros. FDS have any differences, other than possibly sprites? SMB was originally released for Famicom, then re-released for FDS, unlike SMB2 which was FDS original.
I only learned now that Famicom and FDS are actually different things.:o
I think the only difference is that the boot-up is longer and that the Minus World can be completed on FDS.