digitisation vs digitization

digitisation and digitization both are nouns.

Word	Noun	Adjective	Verb	Adverb
digitisation	Yes	No	No	No
digitization	Yes	No	No	No

As nouns, digitisation and digitization are synonyms defined as:

digitisation and digitization: conversion of analog information into digital information

digitisation (noun)	digitization (noun)
conversion of analog information into digital information	conversion of analog information into digital information