Gnuplot: Combined Histogram Clustered - plot

I have 2 separate histogram clustered plots whose x-axis is the same and the bars are also same, but y-axis is different.
I want to represent the combined information from these 2 plots in a single plot. One way to do this is to assign the y-axis of the second plot as z-axis. I have attached a rough example here:
Questions:
Is there a simple way to do this in gnuplot?
Are there better ways of combining such information from two plots together?

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