Applying consistent color format across different graphs

This will definitely work for the field map.  Download the pbix that Icey gives in the accepted solution.  He has created a measure to read a table with the "item" and hex code.  He uses the measure in the "advanced controls" in the Data Color selection, using Format by: Field Value,  Based on Field: Measure.

Unfortunately, my boss wants a pie chart or donut chart, so it won't work for me.  But it does work on the Treemap so you should be golden.