What are you Export settings? Post a screenshot of the same so that we can help you better.
I don't see any big difference. What I think you are seeing is the differences in the screens on each computer.
I do see a visual difference. This could be caused by a lack of viewing the image data in Windows in a color managed application. Do you have another color managed app, perhaps Photoshop or Elements you can view the image in on the Windows machine? The other possibility is the Windows machine has a poor quality display or it's color profile isn't so good.
That's a bad monitor profile. The red shadow banding in #1 is a giveaway.
The proper fix is to use a calibrator to make a new display profile. If you don't have one, set sRGB IEC61966-2.1 as default display profile in Windows. Relaunch Lightroom when done, it needs to load the new profile at startup:
This did the trick, thank you!
Why does some applications use this color profile and some don't? Seems like a quite odd thing that the default setting in Windows 10 gives bad image rendering in Lightroom. I never had to change this in earlier versions of Windows/Lightroom. Should I change color profile on my Mac as well in some way to make sure the images are shown as good as possible? I know that this is a jungle and that you have to know in what form the image will be shown on e.g. the web, but still
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These defective profiles come from the monitor (or laptop) manufacturers, and are distributed through Windows Update, just like device drivers and so on. Not MS's fault.
But why the manufacturers can't get this at least roughly right is a mystery. This is a very widespread problem, and profiles from Asus, Acer, Samsung, Dell, LG and others are very frequently broken.
The display profile is an accurate and detailed description of the display's actual response. It is used by color managed applications in a standard profile conversion, document to display, and the result of that conversion is sent to the display. If the description is incorrect, the application displays incorrectly.
Applications that do not have color management don't do this. They just send the document RGB numbers straight through to the display without any correction. They ignore both document and display profiles, and so are unaffected by any bad profiles.