First, yes, the jets should be the same in both carbs unless something drastic to alter the airflow is different from one side to the other.
Well, i don`t think the amount of air that the airbox can or can`t flow will determine the RPM limit. Things like tuned length of the pipe you are running - Port timing - C/R - Timing - and on and on will have a MUCH greater effect on the limit at which a banshee engine will rev.
Actually, if you think about it, the transfer ports to especially the duration & area of the port face is the smallest point within the whole pump - and the tightest bottleneck. Without the ability to introduce a continuously fresh charge (via the transfers) into the cylinder, rpm`s will climb and then plateau. Provided the pipe is doing its job as well.
True, the amount of air the engine is initially allowed to consume with the lid on could possibly limit rpm, and by removing the lid add a few more rpm`s to the equation, but will this keep it from revving to the moon ? No. If we however did think along those lines, then with out the lid their would still be an "RPM/Air governer" by means of the stock carbs. Put bigger carbs on and you still have a govenor - intake/transfer/exhaust timing.... raise the exhaust to 205* and you won`t be able to rev to the moon because not all pipes can operate properly at that RPM... see how it takes changes all the way across the board to net an effective RPM increase ? (over simplified of course)