
avr |

A cleric who gets the war blessing feat isn't required to get blessings tied to the domain(s) they chose, just ones allowed by their deity. OK, they'd be the same if the cleric followed a philosophy rather than a deity, but that's because a philosophy doesn't have a list of domains at all.
So as far as I can tell blessings could match any allowed by the deity in the case of a multiclass as well.