Differentiation Focus and Production Differentiation

Can someone tell me what the difference between “differentiation focus” and “product differentiation” is?

I took a live mock test with Quartic Training and there was a question with these two options. It was easy to see there was differentiation but I couldn’t pin-point between the two. Thought “differentiation focus” was a red herring but that turned out to be the correct answer.

Many thanks.