B: Sure, I can.

A: Does your plan differ from mine?

B: Somewhat.

A: What's the difference between the new type and the old type?

B: The new type saves electricity.

A: Are the sizes different?

B: We have small, medium and large sizes.

A: Can you distinguish any difference between the two?

B: No, there's little difference.

A: Can you tell nylon from acrylic fiber?

B:  I think I can.

A: Does this year's fashions differ greatly from last year's?

B: Yes, a lot.

A: Has he changed much?

B: Yeah, he is different than he used to be.