Hi,
Copied from https://line6.com/wireless-microphone-system/design#broadcast :
MIX AND MATCH
Combine different components—seamlessly.
XD-V systems enable professional bands or church and theatrical productions to use up to 14 systems simultaneously. Relay® G30, G50, G55 and XD-V35, XD-V55 and XD-V75 systems share the same technology, so it’s easy to combine handhelds, lavaliers, headsets and instruments within the same system—with the same incredible performance.* And since all share the same technology, mixing and matching is easy.
*Compatible units must be running same RF mode.
I think you're good to go but note that I didn't try it myself.
Regards,
Wilbert