It is true up until the ridiculous step of rotating the sprite chip 180 degrees
In short getting DDP to run on anything other than DDP/DP hardware with SPATTR 013 rev 2 is either some fiddly modifications to the PCB, or thousands of changes to the game code
If anyone wants to trade Esprade. for DDP let me know
I think Air Gallet and Salor Moon can be converted to each other, but they're both highly valuable boards so it's not really viable. I think Metamoquester with some work could be converted to either of those though, but, again it's another rare/valuable board.