Can you get more pics? I have hallertau to compare against but I would need to see many samples of the cones and the plant (the various leaves) as they have slight variations between varieties. Once single cone (or leaf) can really look like any other variety. Need to see a bunch to get a good...
My vote will be to say that plant #1 is cascade and #2 is cent.. I have the cascade and the leaves on plant 2 don't quite match what I have for mine.
Yes cascade hops on average produce a longer cone but the plant will also produce smaller cones so it is hard to tell from the pic looking at...