Dressage Prelim 12 - difference between revised versions?!

[redredruby]

Could someone explain the difference between prelim 12 and the revised version? I have the prelim 12 2005 test but when I've looked at the revised test online I've not been able to tell the difference! Help please!

 

[teapot]

Could it be that only the collectives were revised, same as Prelim 14?