So, pretty much you said it has to be a matched set with threading approx the size of the battery.
It's more of a curiosity question. I have an Origin/Aqua combo which is a hybrid, and I have a tugboat style "faux hybrid". Believe it or not, the pieces mix and match... I can put the Aqua on the tugboat body, and the tugboat hybrid connector on the origin connector. Same with the king mod if I take the 510 off of that. I can put the aqua on several bases. It seems there are only a handfull of threading variations... there's the 20x.5, and 20x1 for most mod tubes. The hybrid atomizer seems to work with other hybrid bases.. so mix and match is possible, albeit ugly.
The SMPL mod I will still consider a true hybrid base against other's recommendation. The only difference between the origin and the smpl top part, is the size of the hole. They're both solid tubes, one has a 20x.5 thread on the top, the other has a 7x.5 thread at the top. The Smpl just doesn't come with an atomizer. The Tugboat and 4nine I'll consider Faux hybrid direct connect, since it uses an adapter to convert from the tube connection to the standard 510 connection.
No, the SMPL isn't a true hybrid. It isn't a hybrid at all. A true hybrid doesn't use a 510 connection at all, the SMPL does (as basic/simple as it is). On a true hybrid the battery simply can't short to the atty, whereas that's a very great risk with a direct to battery mod.
Sent from my M7_PLUS using Tapatalk