Those are both solid pieces of hardware. However, I would suggest getting a Ryzen 5600 for a notable per-core CPU buff over the 3600x, which should help quite a bit with games like Civ's AI turn time. And since that CPU, Motherboard socket isn't latest-gen either, you can buy used for cheap still.
On a slightly different note: The 7k series Ryzen CPUs get you on the latest slot, AM5. This will get you future upgradability if you want it, but it will also come with higher costs as AM5 is the newest socket, so people aren't unloading them onto the used market in quantity. Such cost considerations are best determined by you. Both are a solid choice though.
For the GPU, I think the Radeon 6600 is a good choice. Radeon stuff works better in linux and that particular one is plenty strong for what you listed.
I highly, highly recommend PassMark's benchmarks for comparing hardware. They are the first place I look to get relative numbers. And from there I determine what I need/want.
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