Pony Fantasy VI Remake

I expect DA 17 somehow translate to "5 0s in a row," but what does the F7 mean?

I'm not sure. I'd have to check FF6LE or ZoneDoctor source code to figure it out. However, tilesets are from $DE0000 to $DFB3D3, $DFB3FF if we consider unused space after (44 bytes). You could safely copy that block in a hex editor to revert all tilesets to their original state, given you did not modified any (on purpose). Tilesets are not identical in size so copying one would require looking at the pointers ($DFBA00 to $DFBAE3).