As nouns the difference between harmonisation and harmonization. is that harmonisation is (british spelling) (harmonization) while harmonization is an act of harmonizing.

Is harmonization a real word?

harmonization noun (matching)

the act of making different people, plans, situations, etc.

Is it Harmonise or harmonize?

verb (used with object), har·mo·nized, har·mo·niz·ing. to bring into harmony, accord, or agreement: to harmonize one's views with the new situation. Music. to accompany with appropriate harmony.