importing keyboard shortcuts to Mac into premiere pro

You can synch settings using the command in the premiere menu.  Or you can manually locate the .kys file on the source system and manually move it to the appropraite folder in your documents.  for example, here's the path for my custom keyboard in 15.0 on my macbookpro

Users⁩ ▸ ⁨michaelgrenadier⁩ ▸ ⁨Documents⁩ ▸ ⁨Adobe⁩ ▸ ⁨Premiere Pro⁩ ▸ ⁨15.0⁩ ▸ ⁨Profile-CreativeCloud-⁩ ▸ ⁨Mac⁩

You can also just copy it from the appropriate folder from a previous version of Premiere.