Upgrade keyboard to another phone's
I always use (and recommend) SwiftKey, but ...

On the phone whose keyboard you like, install APKExtractor (it's in Play and it's free).

Extract the keyboard.  (It extracts as an .apk file.)

Copy the .apk file to the Note 8.

Install it.  You should now have 2 keyboards.  Go into Settings and choose to use the one you just installed.