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sirlarry-
Conti are good at publishing tyre info (not sure how accurate it is though):-
http://conti-tyres.co.uk/road-and-track/clinchers/gator-hardshell
So going from 32mm to 25mm you'd drop 85g if you use the folding version or 130g if you use the non-folding version (not sure whether it's metal wire or kevlar in the bead of the rigid version).
Greenbank
More information required - if you went from a 32c Compass Stampede Pass to a 25c Schwalbe Martathon Plus you'd gain about 250g.