I'm sure you simply meant to make this comparison based on the fact that both implementations execute scripted functions on the data store server. However, I think there is a very important distinction that warrants a clarification: Stored procedures are saved on the server and then referenced by name. Redis scripting requires that the code be transmitted in each request.

Antirez goes over this in his original post, here: http://antirez.com/post/redis-and-scripting.html