They are the same thing. There are different lines, like lemon pastel, blonde pastel and so on from the different people who started them. Basically when trying to find a nice pastel get one that has no orange or brown on them. As they get older the orange will turn to brown (brown out) and basical look as if you just spent a bunch of money on a normal. A nice pastel should have a striking yellow against black no orange, all get darker as they age but if you go this route you should have a nice looking snake as an adult. I would personally never buy a pastel online unless it was through a BIG name breeder that have great quality snakes. Try to find a breeder around you and look at the babies side to side.