It may look a little funky, but it'll work. There's a "model" 510, and a 510 "threading". Anything marked as a 510 will use that threading. Some caveats:
*Don't use "LR" cartos or atomizers on an ego. There are reports of LR stuff killing ego batteries.
*Don't put a (model) 510 battery on an ego charger. The threading might match up, but the ego charger pushes too much power too fast and can pop a 510 battery. Ego's on a 510 charger however are fine, but charge slow & you need an extension adapter.