Hi,
I don't know a way to plot them at the same time, but you can use snapshot(geom) (or regions,if you're using regions) to get the geometry into separate image file. So you can snapshot both m and geom in the same script, but they will be in separate image files.
If what you're concerned are boundary effects and you only care about the magnetization near the edge, you can also use commands like Crop() to save only a specific part of the magnetization near the boundary, if that's what you want.
Best,
Josh L.