The 3.0L can use it's own and also the 3.2L's radiator, but the 3.2L must have the ATX cooler coils in the passenger side end tank. I haven't seen a radiator sold for a SHO (3.0L or 3.2L) in the last 5 years that did not have the ATX cooler colis, so the answer is probably a "yes."
You can get the GDI 43-2192 new for $127 from RockAuto.com or about $150 with a lifetime repalcement warranty from Pep Boys. It will usually leak at teh end tank seals in about 4-5 years, so the lifetime warranty looks like a good deal to me.