Joined: Feb 2012
Posts: 19,381
Likes: 5,528
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Gary3- Yes it's possible, but not easy to find rims with the same ERD (the dimension where the spoke nipple seat in the rims) always. Without this ERD being the same, or within a mm or two, your spokes will be too short or long to properly engage the nipples.
Another point is that the spokes are likely old and have gone through MANY cycles of stress by now. Additionally the nipples/spoke threads will be gritted up to a degree. These make the reuse of the spokes/nipples more problematic to build/tension well and resulting in less life.
I suggest that you replace the spokes/nipples and use what ever rims you like, not trying to stay with the old spokes. Andy.