Strange sounding, but you would need a 510 to 510 adapter. These are available from online vendors, Madvapes calls them their V2 510 Shorty Extension. Basically it is just a short extender that threads into your battery, and then the device that won't work would screw into the adapter.
I believe the clone part is simply due to the appearance and construction. There are plenty out there, such as the Riva and e-power (e-power has replaceable batteries). Each has minor differences to set them apart. The ego has a little cone device that screws on and covers the atomizer or cartomizer and provides the tapered look. The echo cartomizers have a cone shape to them, so when one is screwed on, it resembles an ego. I don't think the echo has the separate cone, so if you use most 510 devices other than the echo cartomizers, it won't have that tapered, finished look.