AMS-JNB on KL? It is on some days. You can check the seat map on expert flyer, or look up the flights on klm.com and if it says 1-2-1 in the business class features that it’s the new plane. They are flying a combination of 772 and 77W. Only a few of the 77W aircraft have the new one. So just because the day that you want to fly is 77W you still need to check the seat map as KLM has been changing 77W aircraft during last 24 hours for many routes frequently lately so it’s a complete crap shoot.