well in the quest for knowledge, because to the best of my (admittedly limited) knowledge, including (what i took) as a confirming nod about this from a source within Elektron, i’m somewhat surprised that there’s potentially any difference at all … so strip down that 3 kick and snare to as clear and as rudimentary a pure test case as you can … with a .syx dump of a pattern/kit … and i will provide the blind audio test back or at least add some anecdotal feedback as i can A/B both versions here
i do think it is possible that you are right, i’ve seen another case where on a different set of machines a user was getting superior (in terms of attack transient consistency iirc) results from the Mk1 !! - so they may be essentially the same in terms of engine, but there may well be extremely minor and undisclosed tweaks that have an effect