Yes, I transferred the mast base from the getaway mast to the H16 mast. The shape was slightly different, but I was able to squeeze the bottom of the H16 mast just slightly in my vice in order the slip the base in.
I don't think there is a right way or wrong way to do this, but I decided to lay the two masts next to each other with the mast tangs aligned and then cut off the extra from the bottom of the H16 mast. I think it was around 9 inches. This allowed me to not have to move the mast tang on the H16 mast so that I wouldn't have a bunch of holes where the mast tang used to be. Using the getaway mast base and cutting the bottom off the H16 mast, I was able to use the standard getaway shrouds and forestay. I was trying to keep everything as close to standard as possible to avoid issues in the future when I replace my rigging. My recollection was that the H16 shrouds weren't the right length on the getaway, so keeping the mast uncut without some custom rigging wasn't an option. I didn't trim the top of the mast, so I had to add a 6 inch extension to the main halyard so that the sail isn't too high when the bead on the wire is locked in the hook at the top. The tops of the masts are different so the bob doesn't transfer directly. Here is a video that shows how to mount the bob on the H16 mast:
https://www.youtube.com/watch?v=ccRjMWEOy4gHope that helps!
David