I meant the lines of the toe, that the fit would be different seemed self-evident. The shape of the toe box has nothing to do with the fit.
The shoe above is indeed not an Arca but bespoke Arca's have a similar toe, this picture just showed the toe better.
The difference between the RTW and Bespoke last shapes was explained in the Corthay shop just the way I describe it to you.
Here are a bespoke 3 eyelet derby, an RTW arca and a bespoke jouvet. Notice the difference in...