How would you handle it if your manager asked you to implement a different way of working but didn’t explain why?

Is the action you’re being asked to perform something that can get you into trouble with your company? If so, you definitely need to ask your manager for an explanation. If his of her answer seems dubious, or if your manager refuses to give an answer, you should send your manager an email asking for verification of their instructions. The email creates a record showing that you were following your manager's instructions, and not acting on your own. There are numerous cases of managers giving a subordinate verbal instructions, then denying they did so when the subordinate gets in trouble for following those instructions. Since you're the one performing the action you'll be held accountable for it, so make sure to protect yourself.

Is the action you’re being asked to perform something that can get you into trouble with your company? If so, you definitely need to ask your manager for an explanation. If his of her answer seems dubious, or if your manager refuses to give an answer, you should send your manager an email asking for verification of their instructions. The email creates a record showing that you were following your manager's instructions, and not acting on your own. There are numerous cases of managers giving a subordinate verbal instructions, then denying they did so when the subordinate gets in trouble for following those instructions. Since you're the one performing the action you'll be held accountable for it, so make sure to protect yourself.