Oh don't worry about swapping chains in the incorrect bars. The .050 chain is for a 32" bar, and the "like new" .063 bar and chains are 25". And yes, the chains are the correct sizes for the bars. It doesn't sounds like much, but when I looked at the width of the .063 drivers and the track in the .050 bar, there is a large difference.
Anyway, I put the 25" bar on this afternoon and it worked great, so now I don't always have to lug the 32" bar around.
Thanks again guys!!!