You can totally mail them, but they will have to be converted into .mobi and you don't get your current notes, you don't get Page Numbers or X-Ray or any of that stuff. Duno if you care, but you should at least know this will happen.
You should try calling Amazon customer service and see if they can merge the two accounts, I have had (limited) success doing this; if one account doesn't have a lot of purchases, they will in my experience agree to delete them and add them to the other account. Good luck!
