Nice Combination!
If one of those were up for grabs locally right now, I'd jump on it.
I don't know if long term storage does a mechanical system much good. Practical experience and on-line accounts suggest that a fridge that has been in regular operation poses fewer problems than one that has been sitting idle. Of course, some components can wear out, and my late '57 Combo is a good example of a worst case scenario, but generally speaking, use it or lose it applies here. You may be better off plugging the donor fridge in with cold control on the "warmest" setting.
I hope this bump will trigger replies from mechanical experts among us here.