irb 4600 different types

Robot Controller
1

Hello,
Someone knows the difference between the types of the robot irb 4600, for example the type c and the type d.
Is there any official document shows this difference ?
Thanks

2

It’s the different revisions of the robot. type A first model and so on.
Example 2400type A: Elmo motors. 2400type B: Yaskawa motors.
When an updated model is released the older model is named type a.

3

thank you