As long as the 180 has sufficient and even support it wouldn't matter much, but if you stick.it towards the middle that would probably be best without actually knowing what the stand looks/how it's built like itself.
I just know that if you're moving the tank with any substantial weight in it you need something under it to support the glass. If you can't really slide the tank from one stand to the other, you'll probably want to slide a piece of wood under it for support while you're moving it. In this case, I don't think it matters if you move it to the stand, or put it on the new stand and move it then.. it'd just be whichever is easier for you.
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