If the power supply unit was purchased from Digitec and the power plug does not fit...
Digitec is obliged to supply electrical appliances with a Swiss plug. If the unit comes with a foreign plug, a suitable replacement cable should be supplied if the mains cable is pluggable or alternatively a suitable adapter if the mains cable is permanently connected.
If the appliance is delivered without a suitable plug, complain to the customer service and insist on a cable or an adapter, free of charge.
Yes should fit.
If the issue is that Digitec has supplied the power supply without a suitable cable or a non-suitable plug. Digitec must supply a cable with a Swiss plug free of charge. Simply complain.
Here is the website of the FCA (Federal Customs Administration). I assume you have it listed somewhere.
https://www.ezv.admin.ch/ezv/de/home/information-firmen/zolltarif---tares.html
It should fit, it's a normal appliance plug, I have an older Waeco cooler, the plug fits perfectly. It is a 3-pin plug like the ones used for many 230V devices (printers, coolers, monitors, desktops, etc.).