well-kept vs maintained

well-kept and maintained both are adjectives.

Word	Noun	Adjective	Verb	Adverb
well-kept	No	Yes	No	No
maintained	No	Yes	No	No

As adjectives, well-kept and maintained are synonyms defined as:

Other synonyms of well-kept include kept up.

well-kept (adjective)	maintained (adjective)
kept in good condition	kept in good condition
characterized by order and neatness; free from disorder	continued in your keeping or use or memory