[link to original on tumblr]
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I'd thought that it was similar to "Hung up on a Dream" in that it was part of a rising scale followed by a descending half-step (the same sort of thing that "Keeper of the Flame" has), but it's actually just the rising scale part that's similar. That part of "Hung up on a Dream" is in B major (or at least the bass part is; the guitar part is in G major, except for an E major chord [before writing this post, I hadn't noticed that the bass and guitar were in different keys]). There's a key change after the solo, but that's not important as far as the similarity between these two. From what I've figured out so far, "Pleasure" is in E major. But the rising diatonic phrases in both use (most of) the same notes, which isn't too surprising as B major has only one more sharp than E major. The phrase in "Hung up on a Dream" is B C# D# E F# G# G. In "Pleasure," it's B C# D# E F# G# A and then back to E.
I'd thought it sounded similar because of a descending half-step (which isn't even in there), but actually they sound similar because they're mostly the same notes.