All pleasure is pleasure, full stop. The way to differentiate between various pleasures is not by attempting to rank the pleasures but by looking closely at their intensity, location and duration.
I always "like" it when you call our attention to PD09 on this topic. In this case I have a comment in regard to "All pleasure is pleasure, full stop." That very simple sentence stands at the top of a mountain of specific questions. Yes, I agree, all pleasure is pleasure - but what does that mean? I think the answer is that this is a clear instance in which Epicurus (when he says things like this) is talking conceptually, and saying that the common element in all pleasures is that we find them desirable. That leaves a universe of various ways in which mental and bodily pleasures differ from each other, all while remaining desirable.
PD09 gives us firm evidence that Epicurus was not a dunderhead and that the fully understood that all pleasures are not the same in every respect. The concept of pleasure is extremely broad, and that is why it is broad enough to contain "tranquilty" within it. But the reverse is not true - there are many pleasures that are not 'tranquil". That's in large part why the category term to describe what is desirable in life is "Pleasure," not "tranquility" or "true pleasure" or "worthy pleasure" or "fancy pleasure" or "simple pleasure" or "abiding pleasure" or any other term that places a qualifier on pleasure.