The Z is a mesh tank, mesh tastes different to regular wire as it heats differently, some say the fruits pop more and bakeries can be subdued… The temperature achieved (and therefore taste) also is not controlled by wattage alone. The flavours you are putting into most of the mixes are actually designed for food, and just like food, will change flavour at different temperatures, so using two different mods, with 2 different tanks with two different coil types and two different vape styles is certainly going to require a different mix of juice as they will actually be vaporising at wildly differing temperatures.
If you are using wildly different devices you may find you cannot simply vape the same juice. Low wattage MTL vapers will usually find lower VG mixes with a higher nic and flavour content is required to achieve a similar taste - afraid you are not going to be able to find a juice you both like and just mix that if your devices and coils are so wildly different. You may have to experiment with the mix you found to find a balance that suits you both, or mix two differing stengths and VG/PG ratios, and do bear in mind (rawr), pods simply cannot produce the same flavour most sub ohm tanks can (well, 99% of the time anyway).