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The maximum difference is of the order of ~ 2%, and it is in QSJ_23. QSJ_2 3 is the Y Z component of the vectorial part of the attitude quaternion. Usually the attitude quaternion is taken directly from the ATT message in the Magic 7 file. Those messages are issued by the spacecraft 5 times per second. Anyway, there are cases when there is no ATT message corresponding to a particular time interval, thus the codes have to interpolate (or extrapolate). This usually can happen at the very beginning of a run, or because of gaps in the Magic 7 file. The differences between the two codes arises mainly from two different strategies adopted for the interpolation/extrapolation: the old code uses only ATT messages arriving in sync with an ORB message (that is, one time per second), discarding the others; the new code, instead, uses all the available ATT messages. Thus, the new code should provide better interpolation/extrapolation. Anyway, the differences are really small, and I can't think of any application where they could really matter...