The good news is: There's a way to do it.
The bad news is: Right now there's no way to do it "in bulk." You'll have to move projects one-by-one.
Here's how to move your native Sketch files:
* Sign in to Adobe Creative Cloud with your OLD (where your work is) Adobe ID.
* Select the project to share then click on Share/Send Link, then the button Create Public Link
* Copy that link and, using a different browser (so you can stay logged in with both IDs), sign into with your NEW CC account to open that link. When it opens click the Save link in the upper right hand of the screen. This will save the project to your NEW account.
It's going to take a minute or two for it to sync down to your device, so be patient and keep the app open. Once you can see it on your device in your NEW account, you'll be able to open it and work on it on your device and Send To Desktop when you're ready.
If you're going to continue to have access to your old account you can just move the work as you need it.
Thanks, Sue! This will help a lot. - Steve
Happy to help. Let me know if you have any trouble.