@atomicpoet OK, I don’t understand the details, but I understand that it’s mainly a difference for instance hosts. From a user perspective, I find it rather confusing to have many similar services, for which you would need separate accounts.
Some time ago I tried to use #Mastodon and #Calckey in parallel but stayed with Mastodon after a couple of days, mainly because I had native apps (mostly one) for it on all my devices.