Probably in more ways than one

I have a Army issued 1899. It isn't in collector condition (LOTS of holster wear, very little finish left) and I want to shoot it.

The trigger pull is smooth and crisp but VERY heavy. While it isn't in collector condition I don't want to go grinding on the original main spring to lighten the trigger. If I were to get a spring from a 1905, would it fit? If the springs are interchangeable I could lighten the trigger pull but still return it to original if I were to ever want to sell it.