On certain devices (Dallas helped me test it on his Galaxy S10 as I could not replicate it on the Pixel devices I have), the @ionic-enterprise/keyboard plugin will report the height of the keyboard as one value, and the Capacitor plugin will report a different value.

For Dallas it was:
Cordova: 333
Capacitor: 375

The customer had similar results. In both cases, the larger Capacitor number appears to be the correct value.

To replicate this, I created the following app: https://github.com/kensodemann/test-keyboard-height

There are two useful branches here:

cordova: Cordova app, uses @ionic-enterprise/keyboard

capacitor: Capacitor app, uses Capacitor Keyboard API plugin