Step 1: Share the site with your other account. If you’re not the owner of the site, have the owner share it with you. If you're an owner of the site, follow these steps: On a computer, open the site you want to move in classic Google Sites. At the top, click Share. Under "Invite people," add your work, school, or other group email address. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.