I think Conquest's is a little wider (from plumbing to opposite wall) but it has an angled opening so it doesn't feel much bigger. At first I was going to disagree with the others and say that it seems to be smaller, but then I looked at my photo of Conquest's shower and realized it probably is wider.
We sailed Ecstasy last year, about 2 weeks after it was refurbished, and Conquest last month. I don't think you'll be disappointed in Conquest's shower.
BTW, what type of room on Ecstasy vs. Conquest? We had oceanview on both trips and really enjoyed the extra length of the cabin on the Conquest vs. Ecstasy. On Conquest the outside rooms have a sitting area...a couch across from the vanity.
Life's a Beach ... enjoy it on a Cruise!
Carnival Ecstasy 4-06, Carnival Conquest 9-07
Mariner OTS 9-08, Carnival Conquest 2-09
Carnival Conquest 9-09, Carnival Fantasy 1-10
Carnival Triumph 5-11, Mariner OTS 11-11