Upgrade from LibreELEC to CoreELEC?

Thank you.
Another question : I have some similar boxes (S905X, 2GB, model X96 or Beelink or A95X). Is it possible to use the same SD card to install all boxes ?
I would like to create a SD, launch it on a S905X box, install my plugins, installtointernal then re-use this SD without recreate it.
Thank you !