Dropdown's always equal

My dash app has a number of tabs in which each have some dropdown’s on. Some of the dropdown’s across tabs have the exact same options and need to always have the same value selected.

So essentially if the user is on tab-1 and selects a value in one of the dropdown’s - this value needs to be present in the corresponding dropdown on tab-2. Likewise, if the user then goes to tab-2 and changes the value it needs to update the value in the dropdown on tab-1. Currently I can only get it to work in one direction and not the other.