Yep.
1984-1986 used a Delco 12SI (I believe - I'd have to check...) with is the earlier internally-regulated Delco. As I recall, the mounting tabs are 180* apart, so a simple reclocking of the rear case may or may not be called for (which can usually be done with hand tools in about three minutes.)
1987-1990 used a Delco CS-130, but the top mounting ear is offset to about 2:00 as mounted. This does limit options slightly (there are a whole batch of CS-130 applications with different mountings, but identical internals.)
1991-up used a Nippondenso alternator, common to Chrysler vehicles of the era. Swapping in a higher-output unit (like that from a ZJ/WJ/Durango/...) means you're going to be using one with a larger rotor, meaning a larger core, meaning you have to grind the mounting to clear the core. It's been covered here before, so I shan't go into it again.
But, the XJ is an AMC design, and RENIX-era XJs are AMC spec. AMC = "All Makes Compatible." GM sensors and electronics, Bendix control setup, Ford distributor, Toyota transmissions, ... This is a common thing with AMC - they bult their own engines, but everything that bolted to them was an establised part...