Levelling grout is typically very runny/fluid so it self-levels, needs formwork around it until it sets.
Dry pack grout is a very dry mix, meant to be stuffed into the space from all sides and it stands up pretty well on its own.
Not entirely sure the intended use for Rockite is your application under a baseplate. That's not to say it can't be used there, just that it appears to be more of an epoxy bonding grout (ie glue) rather than a baseplate grout intended for even bearing.
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