Yes if you saved your tax return to the thumb drive. You need the file ending in .tax2019 to transfer into 2020. Or the pdf file to get a copy. You can copy them back to your computer.
If you can't find 2019. Here's an idea. Do you still have 2019 installed? Try opening 2019 program and see if you can get your 2019 return to show up in it. Go to FILE - OPEN. Then save it again with a name and place you can find. Go to File - Save As.
