the timing advance/retard on these analog systems is based on the current pulse coming in. The more powerful pulse, the faster the CDI circuit triggers, meaning the faster the engine is spinning, faster magnetisim change, higher magnetic flux, faster spark (more advanced).
this is weighed against the internal components of the circuit (capacitor and inductor) which result in a phase lag as the frequency increases, this makes the spark more retarded.
the two effects are occurring simultaneously in the circuit, and fighting against each other, so having the box work consistently is a delicate electronic balancing act. If one coil has more windings than the originally intended coil, the advance will win because the increase in power is outweighing the lag of the circuit, if you use a less powerful coil the circuit will lag more (generally speaking) because now the capacitor is winning. If you start mixing and matching crazy different boxes and coils that aren't made for each other you will get totally unpredictable results. the only way to find out is doing a lot of testing, or cutting everythign apart and modeling it (very time consuming, but i'm working on doing some of that).
i'm sure pietcard has designed certain boxes to work on certain coils and do certain things, perhaps using the minarelli coil the 2013 will do some retarding, but the bosch coil is too powerful and makes it advance or not retard... the 2041 would have different capacitors and resistors to make the bosch coil work.
without knowing the coil output waveform, the circuit schematic, and doing some modeling/simulation there is no real way of 'knowing' what combinations will work in what way. Even the magnetivity of say, a peugeot flywheel vs a bosch flywheel, will give totally different responses. given the response that pietcard gave, they probably are using 'rule of thumbs' or perhaps the only guy that speaks english has better things to do that explain all that to us.