eGo and 510 are simply names for a threading on a battery or a connection on the vaping device
All eGo’s can accept BOTH eGo and 510 devices because the inside of an eGo thread is actually a 510
Take a look at a typical ego threading
The outside thread is an EGO THREAD
The inside thread is a 510 THREAD
So you can put any eGo or 510 device onto an eGo battery.
The same is NOT true for 510, in some cases you can screw on a eGo to a 510 only device, but it doesn’t always work or is underpowered. There are 510 to eGo adapters to make to process easier but it is generally for Mods or devices that can handle an eGo cartomizer/clearomizer
The original purpose of an eGo thread was to make everything “bigger” and the thread was also a bonus that let companies design “cones” that would hide the threading and make a 510 on an eGo battery look better on the larger eGo batteries.
So bottom line:
You can use any 510 on any eGo and you can use almost any eGo on a 510 with a proper adapter.