Yep, two temporary buffers.
@Ess talks about this here but at that time he was still unsure.
I remember him checking and coming back to make it clear, but can’t find his message 
There’s another thread on the subject that bring interesting elements.
The “Kit Reload on change” parameter can be found in Fn+Global / Sequencer Config
Maybe this works better with your workflow…
Oh, you know you can instant Fn+Clear the name of your Kit right ? Works for any renaming btw.
Fn+Pattern to save your Pattern before tweaking the plocks or changing the trigs…