Yes certainly. Whenever a member merges two profiles they are expected to tidy the Bio by removing duplicate headers and data, a lot seem to forget this important task in merging and leave it for others to do.
If you see any obviosly forgotten tidying that needs doing on an open profile please feel free to do it, there are guidlines on the Style Guide pages in the help menu. For private profiles the only option is a polite note on the profile or a message to the PM.
If at the same time you can add any new information and sources that is also great.