It really depends on the rules in question.
The Mob Rule and the Brotherhood of Psykers usually are dropped because they would act very weirdly or be broken (positively or negatively) in the unique nature that "Every Man For Himself" provides for the game. So ask yourself some basic questions regarding these rules.
For Cult Ambush, for example, are you allowed to put models in Reserve or Infiltrate them in a Kill Team game? If yes, then you should be fine. If no, then no, you will not.
For Return to the Shadows, does its rule interactions interfere with or deal with any other interactions that Kill Team already denies? I am not familiar with the rule, but it sounds like it deals with Ongoing Reserves. Does Kill Team address anything on Ongoing Reserves?
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