One dyno deos not equal another. Its impossible to calibrate both equally. Even the same dyno for two engine tests will give different #'s. As tiny as RC engines are, any slight variance has huge results in #'s. Outside temp, bearing temp, humidity,etc.
Dynos are for tuneing an engine so that engine has the best powerband its going to have. Its a tool to get the most out of an engine. It is NOT a tool used to compare engines. Such comparison can only be made on the track. Sometimes its obvious, but thats not the dynos purpose. Its a shame that its used that way.