This is going to turn into a chit storm I know but Here are some good photos comparing the two hulls.
Tige has been using the Convex V with Delta Pad since 03. The ARS continues to utlize this platform but teh rest of the hull as changed to further enhance its capabilities. Looking at a G23 hull they also started using a delta pad. So both boats use the Delta. That said the shapes surrounding the delta are very different. So at first glance they look similar until you really get under the boats.
So to put the who copied who to rest... 2003 is when it started and tige had it first. The coanda effect is the real deal and both boats capitalize on it and the delta or convex v is a good place to start.