Apart from the TV shows a real repo company needs to use pilots rated on type to meet insurance requirements.
A CJ1/CJ2/2+/CJ3/CJ4 and the Citation Mustang can all be flown under the same type rating although the FAA requires some ‘familiarization’ like reading the manual.
Pretty much all conventional piston singles and twins can be flown by competent pilots.
But you don’t get a repo job right out of flight school.
These guys are highly experienced pilots with many, many types flown.
And they usually operate on a contract basis.
So the repo company has a Rolodex with Lear pilots, Citation pilots, Boeing rated pilots, tailwheel guys and everything else they may ever need.