Yes, only on the first batches of the EnterMice the switches are on the components side. Also, the two holes for the large capacitors are not used on some units, because Pear has used indistinctly low or large profile components on the mounting. There are other modifications added on the last design, like the reset switch or the little connectors on the serial port on some units.
The same on the EXDOS case design.
I think it is better to have a unique design without holes for general purpose, and then trim the case at hand for the particular unit.