Donic has been annoyingly changing "recipes" for their rubber models all the time as many players/sellers in my country realise that. Sometimes they "tuned" it for more spin and sometimes for more speed, so u can't really tell which particular "version" of a certain Donic rubber model u're using
The old JP i tested on my friend's bat had really awful spin compare to M, but people said the latest one had much better spin and as I observed the sponge of the newer JPs has been updated to have similar large pores as the M ver ......
Nevertheless the JP series is "supposed" to be more speed-biased than M ver according to Donic's description, but who knows if they're just bullshitting