There are a few non-physical similarities -- mainly that they're both arguably the highest rated defensive tackle in their draft and were both dominant in the college ranks.
Jeremiah was questioned if Suh will be downgraded because Dorsey hasn't lived up to the billing (so far). Both were coached by Bo Pelini.
You can read Jeremiah's analysis here. He goes over body types (Suh is bigger with less fat), durability (Dorsey has concerns about his leg and conditioning), versatility (Suh can play in a 3-4 or 4-3) and raw power (Suh has more strength, Dorsey relied in quickness).
"There aren't sure things when it comes to the draft" Jeremiah writes, "but I feel as comfortable with Suh as I have with any player to come out in the last 5 years."
Sounds exactly like what they said about Dorsey coming out.