I'm rendering a scene in Blender, and for some reason, the rendered image section is different from the exported image. Note the difference in the wood colour appearance in the sun.
No answer as yet, so, here is my best guess:
In the top-right of the 3D Viewport, make sure to select the correct shading option, then click the menu icon to get the viewport shading options:
If you are not using the scene world or lights that could be an issue.
Next, in the Outliner, click the visibility filter dropdown.
That one between the eyeball (visible in 3D Viewport) and the camera (Renders) is the option to preview render in the viewport. Select it and check to make sure all your lights are enabled. (I don’t think it likely you have anything disabled here, but might as well check.)
Finally, you just need to look through your Scene Properties and World Properties to make sure everything is correct, alas.
I may be wrong on all counts, but these are the first things I’d check.