Measured at +- sea level with the ignition “on” the diacom shows 14,68 psi baro pressure,
14,66 psi manifold absolute pressure, values which are +- equal.

With running engine at idle map pressure readings fluctuates between 5,35 psi and 10,40 psi

Are these correct values?

MAP will fluctuate during idle, the amount will depend on the cam. Mine can run anywhere from 45-49 kPa in gear to 50-54 kPa idle neutral. I haven't done the conversion to see if that's inline with what you are seeing.

One of the fastest, easiest ways to tell is run it open throttle with diag hooked up. Map and baro should be relatively close at sea level. The oem intake won't flow a lot so the numbers will be slightly off.