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Yes, comments are completely equivalent to the posts in every sense. So, upvotes on comments are considered as same as upvotes on a new post. Curation rewards (and all that time frame) also work in the same way on comments as on posts. Hope that helps.

Now I'm picking in your brain and reaching for more information as you seem to have a lot of valuable info. :) If someone posts a comment (and doesn't even upvote) within the time frame, what effect is there if any?

Thank you, well I am just learning and sharing on the way. I guess, there is no effect, if one doesn't upvote and only comments within the mentioned time frame.