Do most troops operate in essentially the same manner?
No. All troops are different. In BSA theory all troops should be run by the scouts with the adults there to facilitate. In reality, each troop is cared for by adult volunteers and they are free to interpret just how “boy run” they want to be. Troops are dynamic and change when adult volunteers change, when older scouts leave, when there is a big influx of new scouts, and when there is a small recruitment year.