Differentiating Acans

Ok, so I have two acan colonies but besides the color they also have another difference. My largest colony is more like individual heads that are all smashed together but I can definitely tell that the ones around the edges are individual heads coming out of a common skeleton. The other acan is more like a single entity, heads and skeleton. So, does anyone know what the difference species are or where each one comes from?

 

Well there are many types of acan but the 1st one sounds like a acan lord Saltwater Aquarium Corals for Marine Reef Aquariums: Drs Foster & Smith Certified Aussie Acan lord 3 Frag Pack - Aquacultured
and the second sounds like an

encrusting acan. Item 496 , Orange Crushed Acan - $22.75 : Wet Thumb Frags!, The Art of Coral Frags

 

Besides the colors those look like the same body types as mine.

 

The commonly available acans are Acanthastrea Lordhowensis, Acanthastrea Echinata and Acanthastrea Bowerbanki. Acan Lords have individual polyps. the Echinata is more of an encrusting species and the Bowerbanki has very large polyps.