Check your colour management settings: Edit -> Preferences -> Colour management
as: https://i.imgur.com/NGiuHqH.jpg
Best guess, M$Paint is not colour managed
Edit: just seen the added image(s) both look the same on my browser, guessing the browser is not colour managed either.
as: https://i.imgur.com/NGiuHqH.jpg
Best guess, M$Paint is not colour managed
Edit: just seen the added image(s) both look the same on my browser, guessing the browser is not colour managed either.