They didn’t share anything with the factory SPW’s but many privateer complete racer package SP’s did very well in competition around the world. Nearly all had different cranks, strengthened cases, rods, pistons and cams plus modified gearboxes. This on top of significant suspension upgrades.
Any bike with that much development and spend can be competitive. HRC helped out with fitting the SP1 race kit based items for the SP2 For homologation rules. Swingarm, forks, headstock, TB’s etc.