The pressure difference between two points depends only on their depth difference, Delta P = rho * g * Delta h, not on the absolute depth. Moving ten meters deeper adds the same pressure whether you start at the surface or far below. This is the ideal static-uniform-fluid result; real fluids stratify by density, and measured pressure differences carry sensor calibration and depth uncertainty.
Changing only the depth changes the hydrostatic pressure difference. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.