Are the EVOD and Protank v2 heads the "universal" ones that can be used on either, or are they specific to the tank listed?
Evod heads can be used in protank but protank heads can't be used in evods. Or so they say. I have used the protank heads in evods and t3s but the bottom cap doesn't screw on tightly. It leaves a little gap. But they never leaked on me.
If you mean these heads - http://www.litecigusa.net/Evod_Repla...evod-coils.htm - they can be used in the EVOD, ProTank 2, Protank 2 Mini, Unitank, Unitank Mini, T3s, and MT3s.
Hard to say anymore. I have gotten away with swapping many into the Evod. My MT3S coils work in Evod but some of my Evod coils dont work in the MT3S. There are so many different ones out there from Kanger that pretty much its trial and error but basicly what is different it the size of rim just above the threads.
The Protank 3 is not compatible with anything else. You must use the dual coil PT3 heads on it. The single coil heads will not work with it.
Apparently, the EVOD heads can be used on the PT3, and the dual coil heads can be used in the EVOD/Unitank/T3s/MT3s/PT2/PT Mini.