Lists vs. Sets Ordering

Hello, quick question - for either lists or sets, is a type of ordering important? For example, with list X: 1, 2, x, does x have to be larger than 2? Same for sets, with set X: 1, 2, x does x have to be larger than 2? Or can x take any value size as long as its not a repeat for the sets case?

No, no and yes.