Well, it's entirely possible that the new (or rebuilt, did you specify?) lower block just has a differently threaded bung because chrysler "streamlined" production of replacement parts. Also, other vehicles that use the 3.7 lower block might have different clearances, different oil capacity, etc. I doubt the shop that did it was even aware or had any ill intent... why would they, unless they swapped out liberty engines constantly?
If the capacity or orientation of the filter is substandard to the original or you have to pay twice as much for the filter or puts you in some kind of hardship, I'd take it back to the shop and ask them to check to see if they can source the KJ neck that attaches the filter to the sump and cross-reference with what you have installed. Otherwise, chalk it up to a solar flare and keep on jeeping and update your maintenance notebook with the new requirements. If you don't care that it's different and just really want to know WHY for the pure truth of it, you should probably enroll in a philosophy class instead. You might get more answers
Dan
