Reasoning for Effects Difference Between Powder vs Tabs

can anyone give a scientific reason or just a reason that makes sense of why powder has different effects from tabs ?

Ordered a gram of 88 from 7OB and blew through it in like 5 days because I wasn’t aware of the difference in effects and just came to the conclusion it was bunk. After reading it kinda seems like the general consensus that powder has different effects than tabs , does anyone have an explanation of why that would be ?