First of all, thank you for the reply

Yes, I'm in Italy and it's not so difficult to find black and blue Australorps here. But you are right, the research is a bit more complicated for the white one. Fortunatly there is a white Lorps breeder who lives in a neighbour city
On the other hands, nobody has got the splash one! I have checked on the Fiav's website (Federazione italiana delle associazioni avicole) and only the black, blue and white Lorps are recognized in my country, that's why no one is interested in breeding the splash one. So Australian and Italian standards are identical
I do not want to partecipe in shows. I mean, it's a hobby for me
However I have googled it and that's what come out:
black x black = 100% black
blue x blue = 50% blue - 25% black - 25% splash
splash x splash = 100% splash
black x blue = 50% black - 50% blue
black x spalsh = 100% blue
blue x splash = 50% blue - 50% splash
White is always absent in charts. Obviously it is useful only to get other white Lorps