The main difference between how roll ups use etheum and celestia is that celestia does not have a cution environment where they can. Means, forince, on scar wallups would post their validity proofs on to etherium, and there's like a smart contract that would validate those. And in celestia, they would just put the data and the validity Proofs on to celestia,. But the validity proof would need to be verified locally because there's no execution environment on on celestias. So that isthemain. The only difference between e the two different modes is aunt celestial is no execution of mine, while on y theorem, there's an