TLRTLH is actually a fairly rare case among the levels from this pack, the easier one being made first then the harder version being done later. The only other cases I can think of where this happened is Mild 2 / Danger 3, Mild 10 / Wimpy 3, and in some ways, Danger 27 / PSYCHO 12 (but in this case, the one that's now Danger 27 was originally in PSYCHO, and the Danger one was an easier version, but I upped the % requirement to 100% upon finding a way to acheive this, thus making it far harder than the original, and thus moved the original back down to Danger - this is that pair The Deadly Climb + Not Gonna Work).
One thing that I have noticed is there's quite a few levels I've made like this one where you start at the bottom and go to the top. The most obvious one being No Salvation of course, but also "Express Lane" (and it's easier version) and "No Time To Die".