Here is a couple pictures to show you sizes of adult carpets and Brbs.
This is my adult male brb. I don't usually weight my snakes but I bred my Brbs this year so I did for both of them. I can't remember their exact weight but they were about 2000g give or take.
My carpets I don't know their weight but the are much much heavier then my Brbs are. You can see by the pictures that carpets have more girth to them then Brbs. Someone mentioned jungles get about the girth of a red bull can(not sure if it was here or another thread) but an adult are actually more like a coke can or a little larger even.
This is my jungle carpet.
Here is my female brb. Pic isn't great but it's because she is hopefully gravid so I don't wanna move her.
And here is my coastal carpet just because.
Both like I said before are quick species when you are handling them but I find carpets a little easier to handle then Brbs. Their extra weight just keeps them a tad slower.