Samsung Note 4 charging cable (ECB-DU4AWE vs. ECB-DU4EWE)
From the data on internet, there appears to be no difference. One thing that could be different is the thickness , measured in AWG. Lower  the AWG figure, lesser resistance is offered and hence better suited for quicker charging. In the absence of figures one has to assume they are both of same AWG, which leaves length as the only differentiator.

Since electrical resistance is directly proportional to length, the 1 m cable would permit more current flow and hence is preferred