I have never heard of a wrong color error on paper money and I don't think there is such an error. I have a 1963 $5 note that has a yellow seal instead of a red seal and was told by a respected dealer that the detergent uniform companies used would turn a red seal into a yellow seal when someone left it in their pocket. I'm sure your 2 notes above and the note you saw on
ebay are just damaged the same way. Be careful on
ebay. People will alter things or find altered things and try to sell them as errors. You can't use
ebay as a tool to see what errors exist. Just a little advise.