Mint has no KDE install which makes it a hazzle to setup and fragile to upgrade. You also wouldn’t gain anything, because they are both ubuntu based systems. Not worth it imo, like a sidegrade.

You can transplant your desktop onto anything, the configuration is stored in .config and .local in your home folder. Bring those to another distribution with the same software (copy while you are not logged in, ie while in live cd or reuse the home partition without formatting) and it will look the same.