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Thanks for the reply, but am I right in thinking, regarding Exact Actuation only, that the same rear dérailleurs can be used between 10 and 11 speed SRAM shifters because the distance the mech moves for each speed is determined only by the shifter? The 10 speed shifter will pull more cable per click than the 11 speed shifter? All Exact Actuation rear dérailleurs will move a distance in direct proportion to the length of cable which is pulled by the relevant shifter, and this is why the Exact Actuation mechs are interchangeable between different speed shifters?

@Eeyorecore Can you explain how Exact Actuation (Road 10 & 11sp, MTB 10sp and below) = 3.1mm of cable pull with each shift?
If the pull ratio of the Exact Actuation is 1:1 then the amount of cable pull from one shift on any 10 speed SRAM shifter has to be more than one shift on an 11 speed shifter. So, the amount of cable being pulled by the different speed shifters is not the same. That would be my understanding and that is why you can use any Exact Actuation rear derailleur with different speed shifters, because it's the actual shifter which is varying the amount of cable being pulled.
AJ