No worries! I'd say yes and no. Writing smut is a bit like writing a choreography (like a dance or a battle), and in that sense, I would say it is not more difficult to write as long as things are well planned.
But also, there is an emotional dimension to smut that IS different from other types of scenes, and that part can make it difficult to write (at least for me). The bottom line is if I'm in the right mindset, it is not very different than writing anything else, but if I'm not in the mood I absolutely can't make myself write smut (as opposed to non-smut, for that I can make myself write even if I don't feel like it).
Usually for smut I have to do the writing twice: the first time to lay out the choreography, and then a second time to add all the emotional aspects, which can take some time.
I hope my answer was satisfactory, I am completely exhausted from my day and have no idea if I make sense. Don't hesitate if you have other questions!