Cultural changes that occur when one culture comes in contact with another is known as:

Cultural changes that occur when one culture comes in contact with another is known as "acculturation".

Culture change is a term utilized as a part of open approach making that stresses the impact of social capital on individual and group conduct. 
Acculturation refers to the procedure of social, mental, and social change that stems from mixing between societies. The impacts of acculturation can be seen at different levels in both the first and recently embraced societies.