insofar vs to that degree

insofar and to that degree both are adverbs.

Word	Noun	Adjective	Verb	Adverb
insofar	No	No	No	Yes
to that degree	No	No	No	Yes

As adverbs, insofar and to that degree are synonyms defined as:

Other synonyms of insofar include in so far, so far, to that extent.

insofar (adverb)	to that degree (adverb)
to the degree or extent that	to the degree or extent that