OK, so I was a bit too greasy to take a whole heap of photos. Here is the back end of the baleno cam before I removed it, showing the two tags on the sensor wheel.

I havent got an image for the jimny one but it has little tags right around the sensor wheel.
In short, swapping the cams over was piss easy. 12 bolts hold the 6 journals on, once removed the cam lifts out without having to play around with the rocker arms. Apart from the sensor wheel the cams are identical.

The jimny sensor housing bolts up to the head and rear journal so I used that one although I think the baleno one would work too.
I didn't do this but I also had a recommendation to pull the sensor wheel off the cam and swap them instead but it is not obvious if the wheel and cam are one part or if the wheel is pressed on. There does not appear to be any timing mark or keyway so getting the wheel back on in the right spot might be a bit tricky. If I can pull the baleno cam apart I might swap them back again at some stage because the baleno cam was in pretty good nick. The Jimny cam was pretty good too, no scoring, so all in all not a bad outcome.
Still to do: sump, oil pickup, adapter on gbox, degrease everything, reassemble grasshopper.