Sort of... Their Demo's started off really fucking raw. Then their first EP's came out and they were a lot more ambient than the demo's. I'd say The Most Ancient Ones went back a bit to the rawer sound, but still maintaining some of the atmposphere of the EPs. Though, one thing became obvious in TMAO, they hated things. Purity was fast, and also hateful with all their hate forest hatefulness.
Battlefields was epic, but yet full of atmosphere and ambience, and lots of ultra hatey hate from the masters of hate, hate forest.
And Sorrow... Was pretty basic IMO. Kind of a "Back to the roots" for an last album.
Then, "The Romans" started focusing on Drudkh more.