From the latest Skyview System Installation Guide, rev AH:
"SkyView units cannot / should not be mixed
For planning your SkyView system, or upgrades, Dynon Avionics recommends planning / budgeting for installing the same “family” of SkyView displays, not to “mix” displays from different SkyView families.
SkyView SE displays cannot interoperate in a SkyView system that includes SkyView Classic or SkyView HDX displays.
SkyView HDX product line will eventually add features and products that are not compatible with SkyView Classic. A future version of SkyView Software will remove the ability to interoperate between SkyView Classic and SkyView HDX.
For planning your panel for the first time, or planning to upgrade displays, the displays should be “all SkyView Classic” or “all SkyView HDX” displays."