In short, the term merger is used when two organizations are colliding into one, but the term acquisition is used when one organization is taking over another and has the upper hand.
Í stuttu máli á hugtakið samruni við þegar tvær skipulagsheildir sameinast í eina en hugtakið yfirtaka þegar ein skipulagsheild yfirtekur aðra og hefur yfirhöndina.