Not sure about it really. If the limit is only no more than 16 colours per tile, then I imagine it could fit into that, but no idea how those old restrictions go, and what happens if theres transparency etc.
It's generally 16 colors (or 15 + transparency, really) per tile, which means most sets use a single 16-color palette for a particular layer or bunch of sprites. It does cut your colors down a bit but it'd be awesome if it could be mapped that way. I'll have a peek with ProMotion and see if I can remap them... (need to buy one first though :-) )
well, theres definitely more than 16 colours here in the fantasy packs, so it might take some fiddling and tile edits to get to 16 colours. You can maybe check out my simpler 16colour packs.