Z-15 now disappeared from official materials as now it's called the AC352, which first flew in late 2016, think it's very likely remain as civilian model, as not even the Airbus Helicopters developed a military version for their H175 product line - just SAR version.
And navalised version of Z-20...that depends on where Z-20 is now at in terms of R&D cycle - if the Army Aviation / Air Force baseline variant has finished its R&D cycle and moved into serial production, logically they got the personnel freed up for further sub-variants or navalsed version. And of course we won't know....perhaps not until a mock-up spotted on the mockup carrier "deck", then we know how far they pushed the project onward.