Regarding DNA?

If for my Maternal Grandmother it says 17.7% shared DNA, does that mean that my Maternal Grandfather by default would have 32.3% shared DNA? And there

If for my Maternal Grandmother it says 17.7% shared DNA, does that mean that my Maternal Grandfather by default would have 32.3% shared DNA? And therefore I would share more DNA with him than her?

or:If for my Maternal Grandmother it says 17.7% shared DNA, does that mean that my Maternal Grandfather by default would have 32.3% shared DNA? And therefore I would share more DNA with him than her?

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