deleting wpsmush.it after installing wpsmuchpro

I've replaced wpsmush.it with wpsmushpro, and it looks like i'm being promted to compress using the pro. are the compressed wpsmush.it files still there. It shows no files being compressed in the pro setup.

If I delete the wpsmush.it files, what exactly am I deleting? Are the compressed versions in addition to the original non-compressed?

Or by deleting wpsmush.it am I deleting all my previously uploaded images (completely) that have already been compressed by wpsmush.it?

Thanks