Do I have to Swap for the same size/colour HuskeeCup?Updated 10 months ago

No. You don't.

One of the great benefits of HuskeeSwap is that it's about an elegant reuse experience, and not a one-size-fits-all approach. 

You should be able to Swap your HuskeeCup at any HuskeeSwap site with any size cup or colour they have available in their float.

If you are wanting to Swap for another size, just make sure they have the size available that you want before or when you order.