correct exhaust on motor swap

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I am putting a 82 gs1100g engine into my 81 gs850 frame. I don't know exactly which exhaust system will fit, other than the original 850 system will not. I am on the fence between a mac gs1000 system (003-0509) for an 80 gs1000g, and one for an 83 gs1100g (003-0609). I have searched the forums and come up dry.

I know the frames are different, slightly, between the 80/81 models, and the 82/83 models.

Other than rear mounting, is there a significant difference in the way the pipes fit between the 1000/1100?

So which one should I use?

Thank you all for you help in your input on this topic. It's good to be able to make an informed choice!