What's already been said, has been WELL said, as to "cross contamination", etc. And, the points made, about snow, ice, etc.
But, to answer your "direct question"........ "does Aquastealth soles, equal felt for grip",
NO! I started out, trying this "revolutionary wading sole", by buying a pair of LLBean's AS soled boots. Wore them for a half hour, fishing and LIMPED back to my rig to change boots! (Thankfully, not trusting them before hand, I'd also packed along my older, felt bottomed, soled boots too!).
I sent them back, to Bean's, for a full refund with a letter as to "why" I was returning them. Next, I looked around and found the "Korker's Multi-soled boots".
BEST, investment I've made so far, in gear!!
They have the AS soles, available in both studded and non-studded versions. They come with a "hiking sole", (non-Aquastealth), and a felt sole. I was given, to try out, the AS soles with the studs, too. I can walk, into and out of, places wearing the hiking sole and then easily switch to the felts, and/or, the felt stud combo, when I reach the water. I've refused, so far, to risk my behind again, by trying the AS with the studs.
But, as has been pointed out............... "the FELT SOLE is only a very minor transporter of contamination". Gators, waders, the REST of your boot, even your fly line, and flies, can cross contaminate other waters you visit, so JUST your "felt soles" are by no means to blame!
I would, never, suggest the Aquastealth soles, for safe wading. At least, not here on Oregon's slick as snot rivers and streams!
Some boot manufacturers state the "their studs are super hard, super tough", and that, in itself, tells me "I'm going to slip and fall, wearing their studs". Because "super hard" and "super tough" studs, DON'T flay out, like softer studs, will do, to grip a rock's surface like a stud SHOULD DO! They're like waking on pin heads, across slick rocks, and that's why so many slip and fall while wearing the "super tough" studs.
Get felts, and/or, AS soles w/studs, in a semi soft metal stud configuration. Your studs may wear, faster, sure, but you WON'T slip and fall as readily, either!
Saint Paul-"The Highly Confused"
You cannot do a kindness too soon, for you never know how soon it will be too late.
-- Ralph Waldo Emerson