The strength of the exhaust brake is dependent on about three factors that I'm aware of.
1. The basic design.... which all three engines use the same basic idea. Something like the Load Leash incorporates a different design that greatly improves its performance.
2. The exhaust pressure. The Cummis (at least in the past) has used stronger exhaust valve springs than Ford so the engine could tolerate more back pressure before the valves started floating. 60 psi has always been the maximum back pressure the Cummins EB has used and I'm not aware of that changing.
3. The amount of air the engine is capable of pumping. A 6.7 litre engine is going to pump about about 355 cfm @ 3000 rpm x the volumetric efficiency of the engine. I know the Cummins 6.7 used to pump about 2.3 x that amount at 20 psi boost. The newer turbos probably push a little higher boost than 20 psi... I don't know?
So assuming the back pressure of the 2020 is the same as yours and the maximum engine rpm is unchanged. The basic design is the same it only leaves the possibility of the turbo pushing a little more air, that could contribute to a stronger EB. So all that to say it probably is a little stronger but its uunlikely to be hugely different.