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If the worksheet was started by dropping in a value from your original data source, it will continue to refer to that data source as the primary even if you exchange all of the data fields out for a secondary one. The only implication I've ever encountered from this though is that maps and geospatial references will go haywire, due to maps requiring to be the primary data source.
The only method I am aware of to change this is to rebuild the viz from scratch using the secondary data source. Usually this only takes about 5 minutes, especially if you are just doing a like for like copy of the original.
Thank you. In my case, it's not so terrible to rebuild from scratch - the viz is pretty simple.