Hey Danny, easiest way for me to remember is to not mix them up
I would not rely on @disciple_dan wrote:
the fine tooth one always go’s on the strike side
With all the different style movements out there I do not think this would be the case. Taking photos of the movement before disassembling always works. If you have to figure it out there are formulas you can use with tooth and pinion counts, center distances ect… you would be able to determine which is which or even figure out a missing wheel size. Though I am going to have to have a couple more gallons of coffee this morning before getting into that . Have a Merry CHristmas