I did this, and used the default mapping. I seems like the drum machine, an elektron Machine Drum, sends a message to the boxes when I change pattern. The new pattern on the drum machine is suppose to trigger (as an example) preset one on the boxes. Instead it triggers preset 21 and so forth. The thing is, if I after this behavior, manually correct the preset via the program change knob, which is already in the right position, on the drum machine it skips to the correct preset, nr 1 t.i. So to be sure I (we) have copied the same presets on two different locations. A little work around.
