Perlite is Perlite - really... I don't believe MG has a variety of perlite that's fortified with nutrients (make sure you read the bag of course) so it's identical to pretty much all other medium grain perlite.
And the moisture control soil is alright... I've used it for many things in the past - but only mixed with copious amounts of perlite. Without the perlite it doesn't drain at all, is very silty and compacts when wet... Your plants will show visible stunting after a few weeks if you use it straight up.
If you have a Wal Mart near you, you'd be better off going to their outdoor department and picking up mushroom compost, potting soil and a bag of perlite. Mix them (maybe 1:1:2, Perlite:compost
otting soil) and you'll have some fine soil.