There is definitely a difference cariad. I have found myself saying it a few times myself. People often think that because they enjoy bondage, or pain, or some aspect of BDSM that they have to be a Dom/switch/sub and wander through life confused because they do not seem to fit in anywhere. Knowing who and what you are always helps.

On another note, it is actually possible to be Dominant/submissive without being kinky. My focus in a relationship is always on the D/s aspect, and if we get kinky also that is great.