How can i know if i can stack some shield on another shield ?

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Yesterday i tried to stack some shield (motor shield) on a shield (servo motor shield) already stack on my arduino Uno.

But i realized, that i have some problem when i try to use both of them. Seems like some energy lost or the stepper motor connected to my servo motor shield move weird slowly.

I already check online, and i found some explanations about stack many shields. About be sure thes shields don't use the same pins or SS. As a beginner, help would be very helpful. Thank you

Here is the two shield i use.

wiki for dynamixel servo shield : Digital_Servo_Shield_for_Arduino_SKU_DRI0027-DFRobot

On these links , can found all the spec with the pin use. I think have some pin shared by both of them... But not sure

Some people have a solution please ? Many thanks in advance

Already answered on stackexchange

Yes , is true . Many thanks . And sorry , i choose to poste here too. Cause i don't know where the community is more present.