Both Uses

vary
in
Volpone
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NAN: 'Cause here the delight of each sex thou canst vary?†
Act 1 *

vary = differ; or change
Rather applaud thy beauty's miracle; 'Tis thy great work: that hath, not now alone, But sundry times raised me, in several shapes, And, but this morning, like a mountebank; To see thee at thy window: ay, before I would have left my practice, for thy love, In varying figures, I would have contended With the blue Proteus, or the horned flood.†
Act 3

varying = differing; or changing

Definitions:

(1) (vary)
to be different, or to change

Vary is often used to describe small differences or changes--especially about things of the same type. It would be more common to say "The weight of full-grown elephants varies depending upon diet and other factors," than to say "The weight of elephants varies from that of mice."
(2) (meaning too rare to warrant focus)