thomas and friends mini series

Quick question for you guys, weighted or not or both? What I mean is the earlier minis were weighted and to me felt far higher quality because of it. So where there is a re-release model do you try to get a weighted one? Not care? or do you (if a completist) have to have one of each version?!?

On a related note has anyone 'transplanted' the weight from a spare/duplicate old mini into an equivalent but different character that come un-weighted these days? You know, weights from all those spare Thomas's into the newer Thomas liveries?!?

Just curious...