I cloned a failing HDD on the WRONG target disk

I accidentally cloned a failing external HDD on the wrong target drive using the

ddrescue -d -f /dev/sdSource /dec/sdTarget

command. Is there any way to recover anything from the target drive ? The target drive is 1 TB the failing external drive was only around 250 MB. The back up drive I used appears now as the external drive I tried to save (same name, same capacity). How do I get back my 1 TB drive?