Is there a particular point of comparison that interests you? I would describe the Muslim Brotherhood and the Baathists to be so different from one another that it might be easier to describe what they had in common than what separated them. Aside from an appeal to a trans-national identity (a Muslim identity and an Arab identity, respectively) and a tendency towards violent and potentially revolutionary politics couched around non-specific tenets, I'm not entirely sure where I would begin with ways in which the Muslim Brotherhood was similar to the Baath party.

Ba'athism was based on secular pan-Arab nationalism. The secular part means that they didn't have much in common with the Muslim Brotherhood.