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It is normal for the D435 to have greater noise ("RMS error") in its depth image over distance than the D415 model. It is one of the consequences of its hardware design, which has the plus-points of a wider field of view, a faster 'global' shutter than the D415's 'rolling' shutter, and a smaller minimum distance (the camera can be closer to objects).
In the RMS error chart below, the upper orange line is the D435 and the lower green line is the D415.
If you need higher accuracy at close range, it is possible to alter the 'depth scale' of the camera.