Here’s a surprising result, the chart shows the pressure in the signal line going to the N75 valve.  The other end of this line is what taps into the turbocharger compressor housing.

The K04’s are operating at a higher Manifold pressure, but the reading from the compressor housing is less than what the K03 readings are for a K03 tune until about 5000 rpm, where the K03 tune drops manifold pressure significantly.