I noticed two different box set covers for the Forgotten Realms 2e, FR Campaign Setting (horsed rider) and FR Campaign Setting Revised (Elminster), but Drivethru only has the non-revised version.
Aside from the covers, is there any difference between the content?
The original box set (with the horse rider) was released in 1993. It was re-released (with Elminster on the cover) in 1996.
There are numerous small differences in the text. Some minor corrections and errata. Some changes in the credits and copyrights. Some changes in the artwork.