In the search of a pair of Bianca, I came across several versions of it. Do the Biancas come in three different heel combinations? I found these on NM.com
The bianca comes in 2 heel heights 120mm & 140mm. There's slight variations in the shoe sizes i.e. A smaller shoe size e.g. Size 34, 34.5, 35 etc might be a few millimetres shorter than the larger sizes e.g. 40, 40.5, 41 etc.