Asking difference

A: Can you see the difference?
    B: Sure, I can.
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    A: Does your plan differ from mine?
    B: Somewhat.
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    A: What's the difference between the new type and the old type?
    B: The new type saves electricity.
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    A: Are the sizes different?
    B: We have small, medium and large sizes.
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    A: Can you distinguish any difference between the two?
    B: No, there's little difference.
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    A: Can you tell nylon from acrylic fiber?
    B: I think I can.
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    A: Does this year's fashions differ greatly from last year's?
    B: Yes, a lot.
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    A: Has he changed much?
    B: Yeah, he is different than he used to be.