Hello, long time lurker here.
There are three PvE maps that should count for both missions, as they are both night and desert maps:
Desert Saber
Desert Viper
Ricochet
I hope this helps, if someone wants to more efficiently grind missions. That is, if they are in an efficient rotation.
Other than that, I look forward to complete two more missions for both my original and my Steam account. Yes, I must be crazy doing it for two accounts, but so far it worked out.