These units are kinda the same, but not at all the same. If you have a conical heater cover for the SSV, yes the glass wands would be interchangeable between the SSV and DBV.
The SSV we feel is by far a better consumption device. The angle of the dangle is very important and when connected, the wand faces up, so gravity is your friend. Also, the SSV features a metal base and when you get the SSV with the spherical flavor disc wand, you just have a better bowl. The spherical flavor disc wand is 2.5 times larger as well as it will NEVER get stuck in the heater cover.
Learn the different glass for the SSV here.