Looking at these, both suffixes are very similar. I looked into the meaning of each which are also rather similar. That said, it seems that '-ization'leans more toward changing from one to another where as '-cation' can more often be in an originating process such as fabrication.
Definition of -FICATION from Your Dictionary.com
- Production; making.
Origin: Latin -ficātiō, -ficātiōn-, from -ficātus, past participle of -ficāre, to make, from -ficus, -fic.
Definition of -IZE from Merriam-Webster
: cause to be or conform to or resemble : cause to be formed into (2) : subject to a (specified) action (3) : impregnate or treat or combine with b : treat like c : treat according to the method of
: become : become like b : be productive in or of : engage in a (specified) activity c : adopt or spread the manner of activity or the teaching of