Remember that some stuff is very different, the AC compressor is where the idler pulley is on 96-up LHD, the PS pump is on the other side, etc etc. Most common wear items (TREs, drag link, etc) can be purchased new pretty easily.
One interesting piece of trivia that can come in handy is that the heater core hoses apparently go very close to the CPS on an RHD XJ. Found this out when one guy on here was having difficulties with his CPS far above and beyond what most people do, it was a 96 or earlier XJ so it had an HCV. Turning off the heat resulted in the problem going away. None of the usual tech nerds, including me, could figure it out till he mentioned that the heater hoses went very close to the CPS, since none of us had spent much time under the hood of an RHD XJ it didn't even come to mind.