All 3 Uses

vary
in
The Fellowship of the Ring
(Auto-generated)

A rather larger body, varying at need, was employed to 'beat the bounds', and to see that Outsiders of any kind, great or small, did not make themselves a nuisance.†
Chpt Prol.

varying = differing; or changing
The guests were not disappointed: they had a very pleasant feast, in fact an engrossing entertainment: rich, abundant, varied, and prolonged.†
Chpt 1.1 *

varied = differed; or changed
Many times he repeated these words in different order, or varied them.†
Chpt 2.4

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)