As a rule, ball pythons don't maintain the same coloration, particularly the same depth of coloration, in adulthood when compared to hatchlings. Some individuals brighten but often lose depth of color. Some gain melanin (pretty darn common). Some change color completely.

Very few colors and tones stay the same, but some more than others. The albino's yellows and white are pretty darn close to identical at hatching and in adulthood. Bananas/Coral Glows have intense coloration as adults, but gain a little bit of peppered black scales. Various super Blue-eyed-leucistic-complex animals seem to maintain the same coloration into adulthood (white snakes stay beautifully white, purple/grey stays purple/grey, super special's mild yellow hues stick around). Black eyed leucisticis similarly have little change as they age, though I have seen the yellow blotches they are prone to having both fade in some and darken in others, but not terribly significantly. The whites on piebalds seems to stay very clean, but the patterned sections are prone to change.

Various forms of hypomelanism can go against the typical "darkening with age". Plenty of hypos, fires (which really seems to be a form of hypomelanism), and similar morphs "brighten". This typically manifests as a washing-out of color, where bright yellows turn more eggshell white, mild browns turn into light browns, blacks turn into dark greys. There still is a color change, but adults are surely not "more brown" than hatchlings.

Enchis are weird because the best individuals seem more "golden" as adults.

As a rule though, you can expect less intense yellows, and a bit more melanin with most ball pythons.

If you want to understand color in animals a bit more, do some reading on wikipedia about melanin, chromatophores, and biological pigments.