Gustav Becker silesia pendulum question

[CollectorOfSpecialClocks]

i have two movements of gustav becker silesia on has a P26 stamp(and has a shorter pendulum bob) and the other a P42 stamp(and as a large pendulum bob) is it possible to switch those pendulum bobs on the other movement and if not does it have to do with the number of teeth on the escapewheel

Note : the movements look nearly identical to each other and the parts will fit in both movements

thanks in advance, Cosc

 

[Thomas Sanguigni]

According to The Clockmaker's Beat Book 2015, the P42 should have an escape wheel count of 34 teeth, and 7 pins on the pinion. Compare the P26. It should be the same if you think you can swap parts. The BPH is 6217.14.