DSP plugs (etc) when moving back and forth between native and HDX-3

[MixerGuy]

Hi all

So I have an HDX-3 rig, and PT Ultimate 2018.10
"main rig"
Cheese grater.
works great.
48 i/o to hardware Avid HDio interfaces

now let us say I wanted to have a 2nd rig:
new Mac Mini
Thunderbolt 2 slot chassis (using only 1 slot)
HDX-1 to get 64 i/o (only need 48 i/o)
exact same HD io interfaces.
hooked to duplicate outboard as main rig.
and I have an ilok for PT ultimate, of course.

if I have an HDX-3 (main rig) PT session that uses a LOT of DSP plugs (HDX plugs) and I open the session on my 2nd rig (HDX-1 with a very powerful late 2018 new mac mini)

a bunch of those DSP plugs will *automatically* convert to native based, correct?

and then... when I re-open that same session (after having done work on the 2nd HDX-1 rig on that same session.... if I re-open on my "weak" cheese grater HDX-3 rig - somehow will those recently native processing plugs somehow switch back to HDX-DSP based plugins?

How would it know to do that?

plus... any other things to look out for?

thanks for any and all info.