We are using thick backs with lock dados.  The DADO machining tokens for the top, bottom, left and right have a parameter(9) named Tongue Tool Number.  This allows a tool to be assigned to the routings that produce the tongue.  Unfortunately, the resulting routings have left hand tool compensation and there is no option to change them to right hand compensation.

The primary reason why this would be useful is dimensional accuracy.  The back has the best chance of matching the size of the top and bottom if the same router bit and tool compensation are used.  There would be no difference in router bit diameter and the variation from tool deflection would be minimized. (Upmilling and downmilling produce dimensional differences that are most evident when using dadoes.)

We are using library 046.1

On a side note, the parameter 2 of the DADO machining token suggests that the direction of the dado route can be reversed.  I was unable to get this option to work.  Another community user was also unsuccessful.  Fortunately for us, the default setting was right hand compensation.