OK for anyone else who might be wondering I contacted Maxon Support. It seems that when rendering several frames a lot of the computing is initially done on the CPU and then sent to the GPU to render. So in my case the actual rendering of the frame on my PC using the GPUs was lightening fast. But because it had to do all the computing then that's what made it seem to be the same speed as my Mac mini. It wouldn't always be the case depending on the complexity of the scene.
I was starting to wonder that Apple's Metal was getting A LOT better… Also when using Team Render you get several CPU nodes but not GPU nodes so any rendering on Team Render with my Mac would be done on the CPU which is pretty impressive speed wise anyway for a little computer.