Does Kratom's vein color mean anything?

the total alkaloid content and the oxindole alkaloids vary substantially between different geographic origins and seasons.

Mg , speciogynine, and paynantheine, stay stable with slight variation, in season, strain and other factors. Otherwise its about the same.

Young plants, which this book calls "red vein" and not white vein, have higher concentrations of 4 alkaloids than mature leaf.