Hey Jeremy,
It's kind of hard to follow those links. But one thing they have in common is that they are online venders selling corals, and not references. On that note, most of them have it right. Scolymia are meaty, bumpy, and mostly an opaque color.
Cynarina are more smooth with large ridges that give almost a bubble look, and slightly clear.
From your first link
That is a Scolymia
Second link
Also Scolymia
Third link, probably a Scolymia
Forth link First one Scolymia
Second one Cynarina
That place is selling those two corals for the same price.

I'd snatch up the orange one in a heartbeat for 30.00
Didn't see anything on the 5 link.(phishy)
And sixth link
Also Scolymia
I would say they have these straight.
As to what is Acanthophyllia, I would say it's in the same class as Wellsophyllia. A made up name in the industry with no scientific merits.