Full Idea
If two things are incommensurable they cannot be incompatible.
Gist of Idea
Two things can't be incompatible if they are incommensurable
Source
Samir Okasha (Philosophy of Science: Very Short Intro (2nd ed) [2016], 5)
Book Reference
Okasha,Samir: 'Philosophy of Science: very short intro (2nd ed)' [OUP 2016], p.80
A Reaction
Kuhn had claimed that two rival theories are incompatible, which forces the paradigm shift. He can't stop the slide off into total relativism. The point is there cannot be a conflict if there cannot even be a comparison.