I'm new to EFI live and need a tune for my LBZ, while looking through the tune library I didn't find any tunes I would like to try on the LBZ from the LBZ library but found one in the LLY library that looks good. I was interested if these tunes from the LLY library will work on my LBZ. I'm looking for a mileage tune with like 50hp.

No they aren't really compatible the way you are thinking.

You can take alot of the same parameters that are involved in the LLY tune and apply them to an LBZ tune. Things like pulse width, fuel pressure etc. There is some differences though that make lining things up a bit difficult though, for example the LBZ commands fuel based on a torque reference where as the LLY does it through fuel commanding by the pedal position. Also, a lot of the scales on the tables for the LBZ are different than that for the LLY so you have to be careful if your copying and pasting data back and forth.

So Yes you can use a lot of the same data for the same parameters. No you can't directly copy data from one tune to the other.