No, not really
A fetish is usually an intense sexual (or just a really intense) interest in something you shouldn't be interested in
They're not always harmful, if consent is provided and the other person is okay with you fetishizing something about them/one of their items or if it's something like art that isn't portraying an existing person, but it can cause distress and mental health issues with many people who have fetishes.
Sex is more of a normal thing, fetishes are (usually) not normal and would cause discomfort in many people without the said fetish