An odd question..
If you use a set of strings for a couple of months, take them off the bass to work on the bass, then put them back on, would you expect them to suffer a bit more in the re-stringing process and sound older more quickly?
I notice that sometimes when I do that the little dents in the strings from being fretted can end up on top, so each string gets more dents.
I recently did this and (although I might be imagining it), the strings seem to be far deader than they were just before taking them off and putting them on again.
Or is it just my ears?