Probably a bit of a noob question... I'll explain the background: I decided to experiment with a custom set of La Bella nickels to get a balanced tension effect, but the .135 B wasn't great (confirmed as being 'a touch dark'). While waiting for a replacement I needed a working set so I put a set of Dean Markleys on and put the four good La Bellas back in their packets. I've now got a new .128 B on the way and so will have two almost new sets. Will it harm the strings if I swap them over a couple of times to see which I like best? Or am I best just leaving the La Bellas in their packets until I next need to put new strings on?