Karl, I'll get around to taking some pictures for you as I promised over the next day or two, but the sealed example I have is Mudflap/Landslide vs Kobushi.

I also picked up Cybertron Defence Scattorshot with Ascentor vs Payload (opened a while ago). So there's two pairing examples.

I'm also fairly sure I picked up Soundwave & Dark Crumplezone together - I seem to recall that I only grabbed DC because he was on the back of Soundwave (and the other options were toys I had already).