Are the Joye 510 and Vapor King 510 the same?

[ThankfulQuitter]

I know it may seem like a stupid question, but are the Vapor King 510 and the Joye 510 actually the same thing? I came across a supplier of liquid I like and they sell carts for the Joye 510, but not for the Vapor King. It sure would be nice to get both my liquid and carts from the same place and save separate shipping. The carts certainly look the same, but who wants carts that don't work with their VP? Surely someone out there has both or knows whether parts and carts are interchangeable on these two models.

Thanks!