I do have 2 homes connected into my Legrand/Netatmo account, but there is no way to only import one of those house into my homeassistant instance for a given house, the today integration creates all entities for all the available houses in netatmo/legrand.
it is actually the reverse problem you have : I have two house under the same netatmo account … and I see them both in home assistant and I would like to see only one!
Meaning that if you put your two houses under the same netatmo account you would see both in homeassistant