G42 is an A&A Global scenario, there hasn’t been any indication from Larry or his team that this rule set is compatible with the single 1940 theater games. If you find out otherwise, please share in the Global forum with any clarifications. G42 was created to shorten games during tournament play, dot sure if that lead is useful, but you can also ask at harrisgamedesign.com
If it’s just about the turn order, you can simply house rule it, or revert to the 2nd edition sequence… play a few times and see what works best would be my advice.
Cheers.