Depends on how "stupid-proof" Intel decided to make their newer 1151v2 socket. I would't be surprised if it fried something, though. (what I AM surprised about, is that the mechanical notches are the same. That seems a bit... cheap... of Intel, not to change the mechanical mating specifications of the newer socket, if it were truely electrically incompatible.)
So, possibly, if it does't fry the mobo VRMs or CPU, then perhaps it really was just a vast marketing conspiracy by Intel to sell new chipsets and motherboards, and they could have easily supported prior-gen CPUs (at the least) on Z370 boards, and/or supported Coffee Lake CPUs on Z170/270 boards.
What I will say is, I fried a nice 440BX-chipset-based rig, playing with a less-than-compatible slotket and a Tualatin Celeron, and some socket-mod wires.
Also, the original 3.3V Pentium 75/100 could have been plugged into their sockets backwards. (Been there, done that.). That action, when powered-up, WOULD FRY the CPU.