can i change piston position for different arm

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The 4640 Regular arm (4640-3077) is the same as: 4040 Long Arm 4820 Regular arm. The arms listed above are for reveals up to 4 1/2" and have a 8 3/8" long rod and shoe. 4640 Long arm ...
The 4011 can only mount on the Pull Side of the door and the 4111 can only mount on the Push Side of the door. Differences - The 4011 and the 4111 cylinders are different and the pinion shafts are...