Same turbo and fuel pump?
Don't know. It's the same handbook for all three engines. Technical data is all the same including bore, stroke, compression ratio and engine speeds.
They are all the same weight and the only difference I can see in pages of info is that the 190 has a 1.51:1 ratio Sx drive instead of 1.66:1 for the other two.
The warranty book mentions different warranty periods and conditions for engines set to "Power Rating 1" all the way up to "Power Rating 5". "Pleasure Use" engines seem to be below Power Level 1.....
My knowledge of marine diesels is minimal, but the only way you get more power out for the same rpm is to squirt more fuel and air in? So Volvo either program the ECU to give more turbo boost and fuel- or as you say they bolt on a bigger turbo and fuel pump.
I would love to pick the brains of a Volvo Penta dealer/technician to see how they do it- which translated means after a couple of months living with the Ocean-Pro/D3-130 I wish we'd gone for the D3-160!