The average over a very large area is just an average, regardless of coastal or otherwise.
Could be the same risk pool, but the average size of the house, the age of the house, the size of the deductible etc, may be different on average, and probably is not normalized for size, condition, cost, and coverage. . .

not worth the time to do anything with the number but find a better investment to make money to cover whatever expenses are going higher which you have to buy. .