左边的尺寸是工厂自己设计的，右边的是按你的要求做的

The size on the left is designed by the factory while the size on the right fits your requirement.

the left size is designed by the factory, but the other side is according to your requirement.

The dimension on the left-hand side was designed by the manufacturer whereas the one on the right-hand one was made according to your requirements.

请注意：dimension是指三维的尺寸，如果是平面尺寸可以用size，为方便起见如果不想特指某种尺寸可以用sample（样本）。