Colt Single Action Army collectors call these "Campfire" switches. More specifically when a part is only a couple of numbers off the rest of the gun.
The assumption is that this mismatching occured around the campfire at night, when soldiers would spread a blanket out, toss their individual gun's parts in front of them as they cleaned and a neighboring troop would pick up a cilinder or other part, which did not match his individual weapon. Since units were often issued serial number blocks of weapons, the mismatched part was often very close in serial range to the balance of the gun.
This may be the case with troops cleaning Lugers together in WW2
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