You are correct, pressure is pressure. But in terms of making power in an engine, it's a function of pressure and volume.
The relationship isn't trivial but a general statement would be that increasing one, and leaving the other would help make more power.
So with the stock turbo, increasing the boost makes more power (to a point)
With a larger turbo, the volume of air (CFM) is increased hence you can make the SAME power but with less boost..... dunno
The theory is actually alot more complex than this but I think I got a close generalization....
The relationship isn't trivial but a general statement would be that increasing one, and leaving the other would help make more power.
So with the stock turbo, increasing the boost makes more power (to a point)
With a larger turbo, the volume of air (CFM) is increased hence you can make the SAME power but with less boost..... dunno
The theory is actually alot more complex than this but I think I got a close generalization....