Raul, this spec sheet for (virtually) all Technics decks shows the specs for the SP10 MK2 exactly the same as the SL-12XXMK2, the SP-25, and the SP-15.
http://www.vintagetechnics.info/turntables.htm
Also, the owners manual for the SP-10MK2 verifies those specs, with a slight difference in rumble-however, since those measurements were attained using different parameters, it's difficult to quantify.
http://www.vinylengine.com/library/technics.shtml
As for:
John think on this: do you think that the SP10MK2 cost 130% more than the SP25 only because an external power supply?, no way!
you'll have to point out exactly where I said that, because I can't seem to find it. It's certainly not what I believe and know-besides the external PS, the SP-10 series has a much larger stator and ring magnet, higher quality circuitry, a heavier platter, and a much more robust build quality in deference to it's market, which was radio stations and professional use.