You would need to remove DRM from your Kindle books to be able to import them into calibre to convert them to ePub to be sent to a Kobo device.
As for colour devices? Most current colour eInk devices use a Kaleido 3 screen which involves an overlay over a B&W eInk screen. This makes the screen look dark unless you crank the front light up. My grandkids like colour for their graphic books but for people who reading text books, I find a B&W screen to be a slightly better choice.
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