I am biased because I have played Part 1 more than Part 2. Thus, I had to solve Part 2 from scratch, and it took longer than resolving Part 1.
Both levels have their red herrings, e.g., the leftmost column in Part 2 looks unnecessary, but is necessary to enter.
-- Simon
I'm not sure which part you're referring to that's supposedly precise, my best guess is
Mining from the start to break through the topmost bar in the second column?
If that's what you're thinking of, then it's both not necessary (there's a variety of other solutions), and also required in the sequel (which in addition introduces another trick).
With that in mind, the only reason I could imagine someone finding the second part easier is that there are fewer options of what you can try, but then again multiple different options end up working in the first part, so it shouldn't take too long to find one.