Sankey chart - Independent colour metrics

When a custom list of HEX colours to use in a sankey chart is specified , the colurs are distributed across the values in the different dimensions. This makes it impossible to control the colours of the same values in a field across the different visualizations. It would be great if the Sankey had the possibility to use a different colour list in each dimension independently.

In the image below, although both objects are using he same colour list and and sorted with the same criteria (amount), the colours are not the same for the same values in the field because the HexColour list in the Sankey is distributed acrosss the values of the two dimensions in it.