Same thing I reckon, early ones were branded Brembo, the later ones Marchesini, all made by Brembo - designer of the 5 spoke was Mar-someone or other, he then got together with Vic and created Marvics!!!
You can tell the difference between cast (Brembo/Stock) five spokes and the Mag fives spokes because the cast ones have a ridge in the spoke, whereas the mags are smooth!
Hi The last original alloy Marchesini's were produced in 2000 used on 996SPS then after that all alloy Marchesini have been manufactured by Brembo- as Marchesini company could not cope with the original equipment supply demand by Ducati