It's more or less the same thing! For mac os it is the same thing. For windows I'm a little confused myself, I suspect it moves within the 1st few times you open LW to the shared folder. Within the LW Library window select the Saved Files folder & press the Explore button. Then do the same thing with the Shared folder & see what the difference is.

The reason the Saved Files folder was introduced is that not everybody shares their downlded files & thus these files wouldn't show up in their library window. But the saved files folder is now a default folder visible only within LW's library folder to show you what you've downlded.