colnago cx1 evo sizing

[KOGAN]

Hi

I am looking to buy a colnago cx1 evo frame and just wanted to check im looking at the right size!

I sit at 71cm (centre of BB to top of saddle)
reach is 53.5cm (tip of saddle to centre of bars)

Currently on my Orbea Opal I have a 120mm headtube.

I therefore thought a 48cm Colnago Cx1 evo frame?? is this correct?

thanks