They don't look as much like a WWII-era US PT as the earlier Norwegian Tjeld class motor torpedo boats, which not only carried four 21-inch torpedo tubes, but were also eventually purchased by the U.S. Navy [around 20, plus variants] to become the US PTF, generally known as the Nasty boats. Used in Vietnam, particularly during the Desoto *brown water Navy* patrols, there's also a sort-of confirmed rumor that there were also two or four CIA Nasty boats as well.
At 80 feet for the Tjeld/Nasty/PCF versus 80 feet for the Elco PT or the Higgins 78-footer, their sizes. layout and general appearance was similar.
Tjeld Class MTB
PT 658, WWII Higgins PT Boat