No. There is no way to directly transfer balance between two Shopify accounts that have RetargetApp installed in them.
However, if you to transfer funds between two or more stores that you own, we can help you with it. Namely, we can refund the balance of one store to your bank account so that you could later use this money for a retargeting campaign on your other Shopify store.
If you’d like us to do this for you or got any other questions, be sure to contact Support.