How many mg of diphenhydramine is equal to a 10 mg ambien?

Not equivalent

Drowsiness
Diphenhydramine is an antihistamine that causes drowsiness by blocking histamine receptors. Usual doses are 25-50 mg. Ambien is what is called a non benzodiazepine hypnotic, it cause drowsiness by binding to the alpha subunit of the benzodiazepine receptor. Usual dosing is 5-10 mg. as their mechanism of action is completely different, there is no dose equivalency.
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Alpha subunit Ambien Antihistamine Benadryl Benzodiazepine Diphenhydramine Drowsiness Histamine Lethargy Oral antihistamine