Ok, found the reason of the mismatch.
Basically it's this (lol):
The owner of that site found nothing better to do than replace the ROM internal name (originally "Final Fantasy 5", of course), by his crap.
In other words, the ROM with MD5 700B76F290E82FEE56487D32F719929D can only be found on his site and is, as shown above, altered.
Thankfully that's all he changed so your patch Spooniest, works on the clean version of the RPGe v1.1 patched ROM (with MD5 5245A6ED780D896F416CC8824AA36182) all the same.
After patching the non-altered correct RPGe 1.1 ROM, the MD5 of the generated ROM should be:
F27A51DD7CF49BEE518BE145ECB3A9FD Final Fantasy 5 - Legend of the Crystals v1.0.sfc
Hope it helps someone, sometime.