By mapping which activities/services are covered directly by each entity (mapping also outsourced services) could help to identify which areas to preserve by each party.
Smaller organisations could be functionally integrated into the bigger one, or even eliminated if obsolete.
New opportunities could arise on areas where the smaller (acquired) company could provide a service to the acquiring (bigger) company. This could be the case when the targeted company would be i.e. in a BCC (Best Cost Country) with significantly optimised labour cost or overhead expenses.