There are reinforcement learning papers (e.g. Metacontrol for Adaptive Imagination-Based Optimization) that use (apparently, interchangeably) the term control or action to refer to the effect of the agent on the environment at each time step.
Is there any difference between the terms control or action or are they (always) used interchangeably? If there is a difference, when is one term used as opposed to the other?
The term control likely comes from the field of optimal control theory, which is related to reinforcement learning.