I've had a variety of T type connectors on batteries and guns, most always fit with each other. it's possible to bend them as well, or if you totally suck ad soldering, melt the plastic in the insulator and the post will actually move out of place, possibly making it loser... but more often than not, just melt the fucker right out of position so it doesn't hook up.
The only time I had them almost not fit was a set of connectors on my charger that were not likely genuine deans connectors.
There's knock off ones that are actually nicer than the genuine ones, they have little ribs on them to help get a grip on them to pull them apart.
The most official looking deans I've had were a brighter red.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.