Correct!
You are correct. Dr. Jerry Robinson was played by only one man, Peter Bonerz, who, in real life, went on to direct TV shows. Chris Partridge was played by Jeremy Gelbwaks (the dark-haired original) and Brian Christopher (the blonde). An interview in People magazine with Jeremy reveals that the reason he left the show was because his family moved out of California. Danny Bonaduce, who played Danny Partridge said in an interview with Howard Stern that the reason Jeremy left was because all of the other kids in the "family" hated him and made his life miserable on the set. Marilyn Munster was played by Pat Priest and Beverly Owen. Their basic features were similar and, since she was a relatively minor character, most people probably haven't noticed. When The Jeffersons spun off from All In The Family to their own series, a different actor was brought in to play Lionel. However, during the run of The Jeffersons, the original Lionel returned.

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