Hi!
I don't mean to insult your intelligence but are you sure it's a Burmese python?
There's not a "pastel" morph among recognized Burmese python morphs. Every now & then an oddball albino with markings similar to what you described will pop up. Usually, not all of the blotches are white. Some are usually yellow or orange (at least a few).
Somone posted one just last month, several threads below this one. Check it out & see if the one you have looks anything like it. Here's the link to it: forums.kingsnake.com/view.php?id=1621073,1621073
This abnormal trait can also be found in some albino labyrinths. Here's an albino labyrinth that I hatched out this year.

"Reversed pattern" isn't a recognized morph either because the pattern has not been proven to be inheritable, yet, at least.
Post a photo of it so we can tell more about it.
Also, when trying to find the owner please consider being as discreet as possible. We big snake owners have enough bad press as it is. If it looks anything like you say it does, odds are it's an escapee that someone is looking for. Please put yourself in their position.
Have a good one!
HH
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Due to political correctness run amuck,
this ol' hillbilly is now referred to as an:
Appalachian American

www.natures-signature.com