Difference between Harmonious and Congenial

HARMONIOUS vs CONGENIAL: ADJECTIVE

Vocally or musically concordant; agreeably consonant; symphonious.
Adapted to each other; having parts proportioned to each other; symmetrical.
Characterized by harmony of sound; melodious.
Having component elements pleasingly or appropriately combined.
Exhibiting accord in feeling or action.
Suitable and fitting
Musically pleasing
Exhibiting equivalence or correspondence among constituents of an entity or between different entities
Acting together to a common end; agreeing in action or feeling; living in peace and friendship.
Showing accord in feeling or action.
Existing together in harmony
Melodious; in harmony.

Used of plants; capable of cross-fertilization or of being grafted
Suitable to your needs or similar to your nature
Having the same tastes, habits, or temperament; sympathetic.
Of a pleasant disposition; friendly and sociable.
Suited to one's needs or nature; agreeable.
Partaking of the same nature; allied by natural characteristics; kindred; sympathetic.
Naturally adapted; suited to the disposition.
Capable of cross-fertilization or of being grafted; -- used of plants.
Having the same or very similar nature, personality, tastes, habits or interests
Friendly or sociable
Suitable to one's needs
Suitable to your needs

Amicable, brotherly, neighborly, cordial.
Synonyms Melodious, dulcet, tuneful.
Marked by harmony in action or feeling; acting or living in concord; peaceable; friendly: as, harmonious government; a harmonious family.
Specifically, in music, concordant; consonant; symphonious; agreeable to the ear. See harmony.
Exhibiting harmony or being in harmony; having parts, forms, relations, or proportions properly accordant each with the others, so that all taken together constitute a consistent or an esthetically pleasing whole; also, being in harmony or concord with something else; congruous.

Synonyms Pleasing, Agreeable, etc. See pleasant.
Naturally suited or adapted; having fitness or correspondence; agreeable; pleasing: as, congenial work.
Hence Suited or adapted in character or feeling; pleasing or agreeable; harmonious; sympathetic; companionable.
Partaking of the same nature or natural characteristics; kindred; like.

In harmony, Pure, Proportionate, Appropriate, True, Sympathetic, Compatible, Harmonized, Symphonic, Consonant, Harmonic, Symmetrical, Congruent, Balanced, Congruous

Nice, Pleasurable, Comfortable, Enjoyable, Supportive, Likable, Likeable, Conducive, Friendly, Harmonious, Pleasant, Compatible, Sympathetic, Sociable, Agreeable

In harmony, Pure, Proportionate, Appropriate, True, Sympathetic, Compatible, Harmonized, Symphonic, Consonant, Harmonic, Symmetrical, Congruent, Balanced, Congruous

Nice, Pleasurable, Comfortable, Enjoyable, Supportive, Likable, Likeable, Conducive, Friendly, Harmonious, Pleasant, Compatible, Sympathetic, Sociable, Agreeable

The one you choose will look more harmonious.
Australia is a safe, friendly and harmonious country.
Jesus was in true harmonious relationship with God.
Harmonious, well balanced with freshness, candied yellow fruits.
Laura has friendly and harmonious relationships with colleagues.
Traditional couples were less likely to have divorced than Harmonious couples, even though Harmonious couples had higher premarital relationship satisfaction scores.
Thales also taught that the world is harmonious, has a harmonious structure, and thus is intelligible to rational understanding.
Harmonious community and harmonious interpersonal relationships negative beliefs, and enables direct experience, the original scale.
We aim at building a harmonious society and harmonious relationship among neighbours.
A harmonious utterance creates an harmonious atmosphere, and an utterance which is not harmonious creates its own phenomenal world.