Simultaneous
Your wife is going shopping. You give her a list of things to buy at the same time. So what do you put at the top of the list?
The instruction "Do A, B, C, ... simultaneously" contains two elements. The first is the action and the second is the timing. Logically they are independent and it does not imply all actions are equally important, just that they're to be done at the same time.
Unless otherwise stated, the first in a list assumes greater importance. It's the way we think. Ask people in an election whose names start with "A". They get far more random votes. Why? Because they're first.
The fact is, the advice "Move A and B simultaneously" is not exactly the same as "Move B and A simultaneously". The outcome may be the same but the emphasis is not.