I’m not sure about that.
I looked into it some time ago and after gathering a lot of information all I could work out was that some people regarded dragoons as infantry thugs on horses and other regarded them as noble cavalry, and everything in between.
There were all sorts of distinctions about the horses, equipment carried, weapons used, and, of course, tradition and nobility, none of which distinctions really decided the point.
It seems that even within the British Army there are, or were, dragoons of both sorts and that this was also so in various European armies.
The term ‘dragoon’ and the function of the units with that title shifted over the centuries, within and between armies.
I looked into it trying to work out the difference between light and heavy horse.
I am able to say with great confidence that I am not sure of the difference, but I have read articles by people who are and, alas, they don’t all agree.