Yes. The folks on the Iron Islands (Theon et al.) are Pirates (and proud of it) do worship a "drowned god" (and have fairly extreme baptism rituals) and their throne is called the Seastone Chair.
It's just that about everything else (flavour, power level, world design, politics) is pretty incompatible between the two series.
It's just that about everything else (flavour, power level, world design, politics) is pretty incompatible between the two series.