I think focusing on one bass is a great idea. It really pays off in performance as I find an unfamiliar bass can be a distraction. I would rather play one great bass than several great basses. I also find switching basses can cause physical problems like back pain.
If I did have two I would aim to get the string length and neck stop the same and not worry about the body shape.
Saying that, it's a nice problem to have and if I did have a room full of basses I think I could cope :-)
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