yes. as long as your apns are correct it doesnt matter which version you run.
i know alot of people here use the flashable zip to fix their apns, but i use "apn backup and restore" from the google market.
it takes some tweaking, but you can convert it to a system app with titanium backup, and use it to restore good APNS from other ROMS you may be using.
i'm running an inverted version of 4.2.2 with zero issues.