WinMerge, will tell you the date saved.(they have a free version).
Click top folder and browse to your Favorites folder, select as shown below.
Do the same with the second folder.
Set filter to none, as shown.
They all match each other and this will list the Favorites and date stored.
They are listed in order by date not name of favorite.
Home page of Winmerge
Download page of Winmerge
This will give you the dates saved.
The 'Help file' may explain if you to move files around.
See: 'Overview of comparing and merging'.
re- merging files.
You may have to use a blank folder as second selection folder to set a difference, it can also be in the Favorites folder and called 'Test', etc
This will enable the merge icons on the menubar,
I have used it to compare and merge but am not able to explain if it will auto-sort for you.
Sorry not of much more help.
Hope this helps