The SMC do NOT fit the new Subsee adaptor for Subal port - I just tried it out today.
The new Subsee adaptor use a clamp with o-ring mechanism instead of screw threads, so there's no way to screw in the SMC.
And because the SMC do not have a straight cylindrical shape at the receptacle end, it cannot be secured by the clamp mechanism of the Subsee adaptor. It simply doesn't stay in.
I'm trying to find out more from Nauticam HK about this issue, will come back if there's any update.