Two different brands

These two brands are both Phenibut HCL, same claimed purity.. One is more flour-like (still with some glimmer though) but the other is much more crystalline with NO flour-like appearance to it at all. Any insight? Should I take a smaller dose than usual with the new one?

These two brands are both Phenibut HCL, same claimed purity.. One is more flour-like (still with some glimmer though) but the other is much more crystalline with NO flour-like appearance to it at all. Any insight? Should I take a smaller dose than usual with the new one?