I could be wrong but...
I think that...when recovering files, those files are not necessarily files which are viewable on the hard drive as originally seen. That's why they have to be recovered via use of a recovery program. There is no point in recovering...files which exist normally on a hard drive and which are seen as occupying that drive.
Soooo...there is no reason for your visible hard drive space allocations to change. If you deleted the files, they were removed from the original HD space allocation when you did so.
I have no idea where you are getting these numbers you throw around, but there are utilities which you can use to what files are taking up space on your system. Tree Size/TS Pro is one.
Recovering them to another drive merely increases the space used on that drive.
Then again, I could just be having another senior moment