Yeah don't get cat6 Ethercon cause it's not compatible with cat5 or cat 6A, 6E or 7 but all other Ethercon is compatible with eachother.
Used to be true but now Neutrik have changed things so the age old "it depends" is the answer to that.
Newer CAT6 Ethercons are compatible with the older CAT5 ones and not compatible with the first generation CAT6.
As far as pass throughs go, the CAT5 ones are not very robust with an exposed PCB on the back that will break off if you look at it funny.
The newer CAT6 variety however is all metal and virtually bomb-proof, so much so that I carry a bunch of them them loose for just the purpose the OP requires.
This is the one you want, not cheap but does the job perfectly.
https://www.neutrik.com/en/product/ne8fdx-p6