Here in Spain, the M340i XDrive costs € 72.100.
With the M technical package it costs € 72.514.
And the 330i XDrive with M Sport costs € 56,300.
The difference 2 between the two, apart from the CV and the 2 additional cylinders is.
The M sports differential and the M rear wing.
Here I leave the configuration links, for you to see for yourself.
https://configure.bmw.es/es_ES/configid/b5v2q5f3
https://configure.bmw.es/es_ES/configid/l6b3z0d1