How can you tell the difference between acans and wilsoni?

[Breakthecycle2]

There a piece at a store I sometimes go to. They have it labeled as "Australian acans", but it does look like a wilsoni piece I was looking it somewhere else. Anyway to tell the difference?

 

[evolved]

Acanthastrea lordhowensis
[URL='http://coral.aims.gov.au/factsheet.jsp?speciesCode=0362#']Symphyllia wilsoni[/URL]