No. There are a few variations here. The simple “bless” on its own, “aww/oh bless”, “bless you”, and my favourite “bless your cotton socks”. From what I gather they all mean about the same as “bless your heart” which is is something like: “this is something I’d say to a box of puppies and you are about as competent and as cute as those puppies in your attempt at doing a human task”

I think there’s a commonality in that both can be used in situations where someone has either failed spectacularly or barely succeeded in doing a simple task, but the “bless” variations are both sarcastic and endearing. “Well done” has none of that warmth. “Well done” should be delivered absolutely deadpan for best results and translates as: “You are a fucking disappointment. Furthermore, I’m disappointed in myself for expecting any better of you.”