Unfortunately, Misu, there *are* 3rd party expansions that require a specific LSB, yes. Otherwise their voices will point to the wrong place.
Joe, I've never used mixmaster, but I can tell you changing the LSB in some packs *will* reassign them with the correct LSB, and some packs are hard coded for a specific LSB; but yes, if baghdad changes the 2nd pack with the same LSB to a different one, and mixmaster can alter all the voice tables for you, then problem solved.
If not, you can: install the 1st pack, and copy and paste all the styles into a custom folder, but you'd have to document which voices go where. Then when you install the 2nd pack to the same LSB, reassign the 1st one, then go through every single style /multipad voice part, and reassign to the voice using the new 2nd LSB. Yes this is time consuming. It means 8 parts for each Intro 1,2,3, Main A,B,C,D, Fill A,B,C,D Break, Ending 1,2,3. potentially 120 parts per style + 4 OTS settings with up to 4 parts each ><
You can reduce the workload by loading up both packs separately first, and seeing which uses fewer samples, and make the one with fewer the remap target.
I'm assuming Mixmaster does that for you? Which would solve your dilemma.
Is it this one?
https://psrtutorial.com/MB/EV_Files/mixmaster.htmlMark