Hey I think I remember you from before!
I am reapplying this cycle after applying super late last round. I had 3 more LORs this cycle, so 6 total. I just used the ones that I thought would be the best overview of me. (2 new and 1 old for most schools)
You should contact the school(s) to which you plan to reapply and see if they will definitely review your old LORs with your new apps. If they do, give them some new ones to go with it, if they don't, pick the ones you like best.
Schools in general want to know what has changed in the last year, and therefore new or updated LORs would be best.
Remember you can direct your LORs to each school.
I hope that answers your questions.