Cullen mentioned knowing a special Amell woman on my Queen Cousland import too, so I think you get that line regardless. The main difference I noticed when importing a Warden Amell, was Mother Hawke talking about her cousin Revka having lost her children to a circle. I don't remeber that tidbit from my Cous import...
Harsh Cullen makes me sad.

He was much kinder on all my mage sympathetic playthroughs. I've only done one playthrough with a red response/cruel Hawke. My evil!Warrior Hawke was awful, but on good terms with Cullen and sided with the templars at every opportunity. She handed Isabela over to the Arishok, tattled on Anders to Cullen, executed Anders
and Bethany (but I had to reload that bit) and romanced Fenris. Also advised Cullen to oust Keran. She was also cruel to Merrill and even rude to Varric. I
hated her, and everything she stood for. My canon characters are usually angel/diplomatic, although I like playing as snarky/sarcastic too!
When you get Keran kicked out of the Order, his other sister, (not Macha) who is a mercenary attacks you later in the game. Keran is so
nice, I hate to do that to him. He deserves love too. I want to build a happy place in my head for my favorite templars- Thrask, Keran, Cullen. They need a murder-knife option for Grace. I despise that wench.