I don't believe they literally think about it like that- but if you move them into new enclosures at the same house, OR move their usual enclosures to a new home, either of those is less scary than doing both at once, because I'm quite sure that every house smells differently to them, so having at least some things that remain the same (including us) is bound to be reassuring. I don't think visual landmarks in your house mean much, but they might be noticing the amount & direction of light, or major shadows -including placement of major furniture & things on walls, things that might seem at first to be threatening (because they don't know what they are)- any changes like that. And like you said, with the new enclosure very close to where the original one was, that's going to feel much the same to a snake.