I think if it was that simple, why wouldn't the icc provider just make the same profile available for both with a simple change of download page? - think about it.
As has been said, the only cost of finding out how close it would be is a piece of paper for the image you want to print!
I would think the 3800 (Ultrachrome K3) would be way off since the ink set is totally different from the 3880/2880 (Ultrachrome K3 with vivid magenta), and wouldn't even try the 3800 icc profiles!
Jpegman