They are Sikorsky Sea-Kings. (CH-124)
They were manufactured by Sikorsky, in Canada, and are 100% based on the SH-3. They have nothing in common with the commercial S61, other than being a military variant of the same basic platform. There are lots of interchangeable designs, parts and systems between the H-3 series and S61, but they are not the same aircraft.
Closer examination will reveal they have;
T-58 engines
24000 Series Main Transmission
Folding Rotor Head (and applicable metal blades)
Short tail pylon (and applicable tail rotor blades)
Short airframe
Small sponsons
