Looks like a PM to me.I have an 8 year old lineaged colony and have seen it grown differently in different systems.and polyps can be greenish or whitish depending on its maturity.
I would say its definately a PM but when you sell frags someday keep in mind that you don't have lineage so you cant be 100% on it. If it takes on a Christmas Tree growth form as it grows out then it is for sure. PM colonies look like purple X mas trees. They are wide at the bottom and form a point at the top.
Same with mine, no growth upwards, just encrusting the plug...very slow.
Also, my polys are green, and it will sometimes look green in color, but then go back to purple....The Lokani and PM look a little similar in shape, but Lokani's are more blue...
i will try to get a decent shot of mine today..it looks identical but only has one branch going up the center about 3/4" tall but the color and flesh and poylps are rite on the money....