It seems kind of weird since there are lots of CNC shields out there designed to fit the Uno, why not standardize the pinout between devices? I found the Uno pinout chart handy for when I was wiring up my Shapeoko so I made pinout charts for both devices so I could wire up my CNC ...
Please note that you cannot connect the BLDC motor using a wrong pinout because there is no wrong pinout as long as you can control the direction. You can connect the three ends of the BLDC windings in any combination and it should work anyway, you'll just have to adjust the direction. ...