This is mostly true. However, there are acquisitions which managed to keep their unique identity and even different salaries (!) after getting acquired. 1. For

This is mostly true. However, there are acquisitions which managed to keep their unique identity and even different salaries (!) after getting acquired. 1. For culture difference: I have heard YouTube culture is quite different than their parent (Goog) before and after aquisition. 2. After Microsoft's acquisition of LinkedIn, from various anecdotes, not only their previous culture is maintained but employees salaries are different as well (salary difference not entirely due to LinkedIn presence in valley vs Seattle - when both LinkedIn's and Microsoft's office exist in a same country outside USA, the employees have different level of perks and monetary compensation).