Well the only correct way to address this is this technically.
Disclaimer: The following information may be incorrect, but is to my understanding only.
>Pewter Pastels are a Pastel Jungle X Cinamon Pastel, and that the Amber is a Pastel Jungle X Cinamon Pastel<
Pewter Pastels are in my understanding Pewters (for short) proven by Greg Graziani from a Pastel x Cinamon pastel. Amber pastels are from a Pastel x (thought to be) Cinamon pastel produced by Amir from Sunset Reptiles. Truely the differences in the offspring are visably different. Unfortunately without proper permission I can not post the photos to clarify this.
>Also aren't a pastel and a pastel jungle the same thing?<
Yes a pastel and a jungle pastel are the same morph.
>Then why is s Blonde Lesser a Pastel X lesser Platinum and a Platty Pastel a Pastel Jungle X Lesser Platinum?<
Pastels come in different lines of genetics. Blonde Lessers are the line of Blonde Pastel x Lesser Platinum. A regular Pastel x Lesser Platinum is simply a Lesser Pastel (aka Pastel Lesser). There is a visable difference in the lines of pastel which have been crossed with the different lines of pastels.
(On a side note: There are snowballs that are created with different lines of axanthic. The VPI line of snowball is visably the 'cleanest' and faintest pattern in comparison to the Joliff and Snakekeeper line of snowball. All are still called Snowballs.)
Hopefully this helps a tiny bit. . .maybe not. Ball python genetics just get more confusing as you go along.
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Violette Garcia
www.shakahnsgrove.com