You can export the vendor list to do this, nextroof.
In QuickBooks Online, contractors are categorized as vendors. That said, you'll want to export the vendor list and import it to your other QuickBooks account.
You can then import the Excel to your other QuickBooks Online account. Please check out this article for the step-by-step instruction:
Move your lists to QuickBooks Online.
If you need further assistance, please don't hesitate to reach out to me.