The Model 25 looks almost identicle to the Model 29A but is a different gun inside and the parts won't interchange.
The Model 25 was discontinued in the late 1920's and the Model 29 was brought out which was a slightly updated Model 25 , but not the rifle the original poster asked about.

This Model 29 was dropped after a couple of years and the Model 29A was brought out about 1932/33. Different mechanics inside, but again they all look much the same from the outside.

They all kinda look the same:
Model 25...pre WW1 pat... mid to late 20's
Model 29...updated Model 25,,1930 to 1933(?)
Model 29A, 29B....complete redesigned mechanism..1933(?) to 50's/60's. 29A-smooth top recv'r,,29B grooved recv'r.(I think I got that right!)

added.....a few 29B models are marked '29G' for some reason (grooved?). No difference in the two other than the marking.
Lots of small variations through the years as typical of Savage mfg.