I have two ListContourPlots which have different min and max height values.
plot1 = ListContourPlot[{{1, 1, 2}, {1, 2, 4}, {1, 3, 6}, {2, 1,
3}, {2, 2, 1}, {2, 3, 1}, {3, 1, 2}, {3, 2, 9}, {3, 3, 12}},
Contours -> Range[0, 20, 1], PlotLegends -> Automatic]
plot2 = ListContourPlot[{{1, 1, 13}, {1, 2, 17}, {1, 3, 16}, {2, 1,
3}, {2, 2, 20}, {2, 3, 19}, {3, 1, 2}, {3, 2, 19}, {3, 3, 13}},
Contours -> Range[0, 20, 1], PlotLegends -> Automatic]
I would like to ensure that same height values get the same color, ie both plots should have a scale from 0 to 20.