In context|biology|lang=en terms the difference between acclimatization and acclimation

is that acclimatization is (biology) the climatic adaptation of an organism that has been moved to a new environment while acclimation is (biology) the adaptation of an organism to its natural climatic environment.

As nouns the difference between acclimatization and acclimation

is that acclimatization is the act of acclimatizing; the process of inuring to a new climate, or the state of being so inured while acclimation is the process of becoming, or the state of being, acclimated, or habituated to a new climate; acclimatization.