The pressure of the liquid at the bottom of the container is F=G=mg, because the mass m of water and brine is equal,

So the pressure of water and salt water on the bottom of the container is equal, that is, F A = F B；;

From the meaning of the question, S A > S B, because F A =F B, P A < P B is known from P=FS;

Since ρ brine > ρ water, the volume v of water poured again is equal to the volume of brine.

From m=ρV, it can be seen that m' water < m' salt water, after pouring water and salt water,

Their pressure on the bottom of the container is F'=G'=(m+m')g, so F A' < F B',

Because S A > S B, P A'< P B' is known by p' = f 's.

So the answer is: equal, less than, less than.