Parts Compatability 94, 97

I'm hope someone can help me. I'm wondering what parts are compatible between two model years. A 94 and a 97. I replaced my old '97 Voyager with 120K miles with a '94 Grand Caravan. I'm trying to figure out if I should keep the '97 around for parts or just sell it.

The '97's strut towers rusted completely through, and it was leaking tranny fluid and oil at a pretty fast rate. So I don't know how much I could get for it. But in the last two years I replaced all the brakes, rotors, drums, pads, maybe calipers? and some air conditioning components including the compressor.

Also, wondering what could be causing a "wobble" in my steering wheel at about 50-55MPH. It felt like unbalanced tires to me but I had a new set put on yet the problem persists. This is on my '94.

Thanks in advance for any help.

the wobble could be caused by bad half shafts on the transaxle. should cost about $75 ea at parts store.