off the beaten track vs off the beaten path

off the beaten track is an adjective but off the beaten path is not an adjective.

Word	Noun	Adjective	Verb	Adverb
off the beaten track	No	Yes	No	Yes
off the beaten path	No	No	No	Yes

As adverbs, off the beaten track and off the beaten path are synonyms defined as:

off the beaten track (adjective)	off the beaten path (adjective)
remote from populous or much-traveled regions

off the beaten track (adverb)	off the beaten path (adverb)
not along the usual route	not along the usual route