Connecting / migrating keyboard & mouse to new Mini

[GratefulAnt]

Just bought a new Mini M4, and can't get it to connect with my Apple keyboard or Victsing PC253A Mouse. Keyboard is synched with old iMac - does it need unsynching first? Mouse uses a USB3 dongle, but looks like it has 2 bluetooth options as well - have tried activating those (while old Mac off), but they won't connect. Please help!

 

[Rodananne]

Did you solve your problems?
You will probably need to Un-Pair the keyboard from the iMac although there is a feature called Universal Control where you can use one keyboard or mouse with more that one Apple device I've never used it successfully. See here;

Use one keyboard and mouse to control Mac and iPad

With Universal Control, use a single keyboard and mouse or trackpad to work across up to three Mac computers or iPad devices.

support.apple.com

As for your Mouse, it's not a brand I know so you may have to refer to the manufacturer's instructions but broadly speaking if you un-pair it from your iMac and put it in pairing mode you should see it in Bluetooth options on your Mini.