Whig - Maybe I'm missing something, but, during the periods of 'updating' or 'converting' U.S. model 1894 Krags to an 1896 configuration, they would have been taken apart.

The actions required some 'local annealing' for the machining of the 'slot' for the 'hold-open pin'.

The stocks required machining and fitting of the wood that fills the "Cleaning Rod Slot", likely changes in the Butt-Trap area, and at least partial refinishing of the forearm.

One would expect parts were processed and put back together randomly, making rifles that were new combinations of parts.

Your action manufactured in 1894 coupled with a stock from a Krag manufactured early in 1896 is not surprising.

More problematic, is the contrast in the condition of your metal, when compared to your wood.
This may indicate they were not all that fussy with the appearance of these 'near obsolete' arms at S.A. or someone simply switched stocks sometime after the "Springfield Armory model 1896 update".

BTW - (There must have been some reserve stocks available for replacing broken stocks in the field).

A stock switch could have been done by a National Guard or WW1 Armorer, a collector, or .... ???

p.s. - I didn't do it .... and it is still a beautiful Krag!