process dimension vs. Full Process Optimization

Hi,

I'm running BPC 7.5.

I'm just wondering, is there any difference between going to Admin > Console > Manage Dimensions > Process Dimension and say selecting an application to process vs. running a "Full Process Optimization" via the "Admin_Optimize" package, for the same application?

The only difference I can see is that you can compress and defrag in the package.  Aside from that, are the two processes doing the same thing?

(same thing being Processing the dimension)

Thanks,
Jon