Hey guys, does anyone know if the CV joints on a 90 TP executive magna will fit onto an 89 TP magna?

As long as they both have the same transmission then i believe they will swap no issues.

same as above.
all tn-tp stuff swapable, tm's on its own.
same diff for auto and manual.

all tn-tp stuff swapable, tm's on its own.

Nope. MOST parts are but not all. the tn tow pack does not fit and im sure i could think of some more things.
but most of the mechanical will like the cv's if it's manual to manual or auto to auto will as said above.