I did weigh my 525 x 98 link chain from my 1198SP at 4.0 lbs and the 3D520GP 520 x 98 links at 3.4 lbs, so a savings of 0.6 lbs high speed kinetic weight. It’s a really big deal if your doing serious weight savings.The CBR1000RR SP uses a 525 chain, I switched to a 520 GP 3D chain and it weighed exactly the same. So you might save a little weight on the rear sprocket but maybe just a bit on a 530 chain conversion. My 520 GP 3D chain weighed 4.1 pounds so weigh your chain before doing the conversion so you will know the weight savings and won't be disappointed.
Maybe you weighed the 3D at full new 120 link length?