Not sure if it’s Sugimori himself who re-uses parts of artworks, but here is another example of lazy re-use of parts of existing artworks - also all by illustrator Ken Sugimori (which I posted earlier in the TIL thread):
Tbh, I think Ken Sugimori only makes illustrations of the Pokémon and persons themselves, and someone else adds the backgrounds. That’s also why almost all Ken Sugimori artworks during the WotC era had a basic background (which were actually great background choices for his art style 
). Ken Sugimori is probably one of the few illustrators who doesn’t design the entire Pokémon TCG card artwork, but only a part of it.
Greetz,
Quuador