Not doing something because it is not right is moralistic or legalistic.
Not doing something because it’s not what we most deeply want to do is an deep appetite (indulgence) beyond gratification.
I most deeply want to be with Him in all I do. Without His presence, nothing matters, nothing is gain, even if the work is a success.
Not doing something that is not right is realizing something is wrong and trying not to do it so you can do what is right and avoid the hurt and consequences of the bad, by trying to be good. Not doing something because it’s not what we most deeply desire is following the flow of what is already in us to do. As Christians, we most desire GOD, so that keeps us from doing things that would take us away from God’s presence. One, is you trying to force a behavior regardless of your motivation or inner desires. The other is you giving way to your greatest desires and not allowing lesser options distract you from what you want the most.