Pascalite is one clay that I have not done extensive testing on, mainly because the owners do not and never have had plans to extend their operations.
That said, chances are Pascalite is LESS absorbant than our green desert clay, as it is a non-swelling clay. As for the sorption rate, I honestly do not know. It is probably either similar or a little bit stronger.
However, the body often "notices" the absorbant property more than the adsorbant property, since the swelling capacity does more to actually change the bio-terrain... at least, when used internally.
I like Pascalite for what it brings to the table "energetically". I had a client of mine do an extensive marketing research focus group, and our green desert clay was preferred by a very wide margin, although the use tested was for topical, cosmetic use.
Let us know if you have anything interesting to report, I haven't messed with Pascalite in quite some time!
In all of the classes of clays out there, I would our green desert clay about right in the middle of the sorption spectrum... on the lower side if you include micronized zeolite, in the middle if you only include natural clays.
If you need less sorption, French green illite is a great choice, although it has a very pronounced topical effect specifically on tissues-- for better (sometimes) or for worse (other times).