This is where the editor’s creativity comes into play. There’s a section in my Hobbit edit where I combined three different scenes into one sequence (The bit where Thorin gets his sword back from Legolas in the battle, if you’re curious) and it took a ton of tweaking to get the audio right.

Is it completely invisible? No.
Is it perfect? No.
If the edit is working in a story driven, emotional way and you’re not looking for the change, does it work without being too noticeable? Absolutely.

That’s the best way to look at what you’re trying to accomplish. 90% of the time, what you want to do is possible, you just have to get real creative with it.