Two? Wow.
Guess one copied the idea off the other or, by small chance, both had the same idea of putting in a wipple supercharger and a large turbo inside a 90's Cutlass.
I understand the benefit of a twincharger where the supercharger helps the low end and the turbo helps the high end. However, it wouldn't be something I'd do.
You should probably let your friend James know.