I've got a Bali Mariculture piece I got last June that has done that.
Not unexpectedly, it changed from the coloration it came in with - but ended up a solid purple color w/ blue on the growth tips.
I fragged it into two when I put it in the tank, and then fragged one of those after about 6 months - putting a small frag on my overflow.
That coral has turned a much lighter greenish-turquoise color, without the purple of the the other one. The other piece in the tank is closer to the solid purple, but on the encrusting base getting a little of the greenish/blueish color.
Given they're all still golf ball sized and growing out - it wouldn't suprise me once it gets to 4" that it might combine all these colorations, or do something new again.
Will try to get pics ... but I have seen this on a few corals [my scripps millie seems to have changed a bit when I moved it across the tank] - likely will try to grow out two colonies of both of these corals, as they'll color a bit different.