As @SanfordWhiteman said, technically the answer to your question is yes.
However, if you are editing the content of your emails beyond updating the year, I would suggest to add an end date to your original emails (assuming from your description you are indeed running an engagement program) and create new emails that become available from Jan 1st. With differing content, you would want to evaluate how the new version performs against the old one.
It would not be that more difficult (just clone the email and update the new version), add an availability to the old one in the stream and add the new email to your stream, again defining availability.
... View more