Patterns generaly stay quite simular but there can be a big colour change. What morphs are you looking in to? Im sure we can show you a few examples of colour change for any specific ones.
I noticed in the 'morphs' topic that someone suggested posting pics of their corns young and then old, but I guess this would take some time to complete unless you had old pics available for a corn you've had for a while.
I noticed with the anery corns as well that the colours seem very vibrant when they are young but fade as they get older.
you need to allow for a certain amount of variation in adult colours too. some snakes are to the paler end of their particular morph and some will be darker. sometimes it's difficult to tell, eg. a dark amber could be mistaken for a caramel, and you have to go back to the genetics/parentage. corns often go darker when they are over 8 years old too.
cornsnakes, ratsnakes, bullsnakes, boas and day geckos