Ok, so I've applied this and it works so that the FIRST difference between "NetSales" and "TEUS" is fixed. So that if, for example, my filter options are: AA, BB, CC, DD, EE, FF and GG.
If I unselect one in NetSales, say BB, then in TEUS BB will be unselected. But if I unselected BB and DD, then in TEUS only BB would be unselected. Same applies with selecting something that's already selected.
Unfortunately, the filter list for the project is... well, enormous. Just applying the filter in one of the options starting with "V" gets a 3 minute wait time before it's applied to TEUS as well. So (for better or worse), this aspect of the project has been scrapped. I may or may not look for a way for this to apply ALL filter changes, but for the time being that's going to remain an idea and nothing more.
Thanks for the help and I'm going to label this post SOLVED.
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