For a turbo car with the intercooler front mounted that actually is a small opening... the Mazdaspeed 3 I had before my Focus had a MUCH bigger front grill and it had a top mounted IC from the factory.
I'm sure at some point there will be an aftermarket grill made with a bigger opening in the front, but as it sits now... if suss is correct and the openings really aren't different, you should have no issues swapping.
Although to be on the safe side... popping out the side grill pieces and using a dremel to open up some more holes would be a good idea, since they're there for show, making them functional could add that extra horizontal space the ST looks like it has.
2012 SGM SEL Sedan Job 1 BD 6/2011
FSWERKS Cool-Flo w/ ITG Filter | FSWERKS Stealth Exhaust | 17x7.5 Axis Sport XMX Graphite wheels | Eibach Sportlines on Ti Handling Pkg bits
Sonic Crew #28