I think the answer will be - NO!
There are too many variables here. One is the external size of the Castle - Anvil confined on a small Island - Cheydinhal and Bravil sprawl over a larger space, but most of it is empty grounds.
On the other hand Anvil has more extensive interior than some others. Internally, there are basemants, wine cellars, tortire chambers, secret passages that you could decide to include, or not. Where does Fathis Aren's Tower start and Bravil Castle end?
There's the number of staff and guards employed at the Castle, and which guards are Castle guards using town barracks, and which are town guards using barracks in the Castle?