There is a distance and a difference, however, how big that is, depends. One can be dominant without being abusive.
But people who have been victim of anything they feel as wrongdoing, may repeat similar behaviours, typically either because they acquire them as if they were normal, or because they kind of feel "entitled" to it to correct the wrongdoing to them.
It is not by chance that statistically the majority of people who are in a certain category of abusers, have been abused themselves.
Being abused, can bring to being abusive.
Also, no intention of offending anybody who likes to be dominant in the bedroom, but dominant can be pushy, and pushy can become abusive, even because, especially on a psychological level, it can be something that depends on the target characteristics and perception as well (in other words, the perception of the submissive, not of the dominant), it is the reason for the suggestion (could be said "rule", but it not a legal rule) of having a "safe word" - that allows to separate more easily what would be dominant accepted by the submissive, and abusive that goes beyond the acceptable limits, especially if the people involved have not had a long time to learn their mutual limits, and a permanent relation that allows them to sense the possible changes on those limits due to other factors.
So, no, they are not the same, but going from one to the other, and from hurting for a bad behaviour to replicating it, even as a kind of "transfer vengeance", is unfortunately less difficult than what people think, it also has lots to do with how much the person is sensitive to the influence of the environment and others, and how easy she is to be influenced.
From that point of view, if Myriam was in contact with people that would push her in a certain way, even just giving her the wrong idea of strength, she could go there even more easily than what I myself suggested.