Two Garmin watches alternately

Hi,

just waiting to arrive new Descend G1 watch (bought primarly for diving) but I wish to use it alternately with Fenix 6X every day (for example for sleeping because it's lighter). Is it possible to have all the stats sync from both devices (training status, sleeping score, HRV etc.), and (except True up turn on) do I need to do anything else, like switching Primary wear. device all the time?

Best solution and what I wish for is not thinking at all, just replacing the watch on my hand according to my needs.

On Garmin I have of course one account.

Thanks in advance for the answers,

Darko.