G’MIC filter Transfer Colors (Patch-Based) is very well suited for this.
You can use the grand canyon photo as a template.
Load the rendered image and Grand Canyon photo into Gimp as a new layer (first the rendered image and then Grand Canyon photo via File - as a new layer). Then move the Grand Canyon layer down as shown in this image:
Start G’MIC and search there for Transfer Colors [Patch-Based] Filter (either enter it in the search box above or select it from the Colors Menu). In the filter itself, in Output Options, Bottom layer should be chosen as Reference. In Input/Output as Input layer should be selected Active and below: