The other two...if 'sash lock' means a 'slam and lock' one, then
combining that with a mortice is not uncommon. The former for when you're
in during the day, the mortice for added security at night or when out.

One is a plain five lever mortise lock the other is a similar lock that has a square hole for the shaft between door handles to go through - designed to be mounted under a pair of lever door handles.