Arm warrior rotaion

The difference between the arm warrior rotation and simc website is not small.

Is there any major difference?

I’m not really sure what you’re after.
First you state the difference is not small then you ask if there’s a major difference.

You can ‘read’ both rotations and look for differences or you can compare the results of the simulations. If you’re comparing results you should read this post first, to make sure you’re comparing the same fight.