If you want to post a link to your answer in another question, it might be better to vote for that question to be closed as a duplicate if it's the same question.
If your link helps clarify an answer by adding to or explaining the answer, aka supporting material, then sure comment with the link. E.g. a tutorial that's similar but explains it in a different way. Another example of this might be adding more information to the answer by linking to a related wikipedia article, or a related question.
If the link leads to a codepen style site or a github repo that acts as an example of using the answer, that's okay too, though rare. E.g. "Ah yes! This is what the XYZ library does at https://github.com/....."
If the link just leads to a place that used the answer though, then no, that doesn't help the answer, or enhance/improve it. If it worked for you, you don't need to link to your site where you used it, up vote instead.
Linking to your site in this way would be self-promotion and many would consider it spam. If you linked to an article on your site on the subject that expanded on the answer, that's different though.