Not quite the same. It is more like painting by numbers.
The most important bit to remember about compositional rules is that they are there to help, not to dictate.
They are not perfect. One big problem with them is that they are 'frame driven', not 'subject driven'. So they tell you how to put something inside a given frame, but never tell you that the subject might be better put inside another frame.
They also do not take the nature of the subject into account. They cannot, because they cannot know what it is that you are taking pictures of. And that can make a huge difference to how you want to place different parts of the subject in relation to each other.
So i do believe that the best thing to do is to study your subject, decide how it should be captured on film, without having a specific frame in mind.
Then see how it will fit inside the frame you happen to be using. And if necessary, be prepared to crop, rather than to force it inside that arbitrary frame.
But yes, i do see the fun in trying to make best use of a given frame too.
Depends on what you want to do. Take 'portraits', of things, situations, people. Or create pleasant pictures.