They are both spice mixes, but rasam powder has more u003ca href=u0022https://amzn.to/40ioTKnu0022 target=u0022_blanku0022 rel=u0022noreferrer noopener sponsored nofollowu0022u003eblack pepperu003c/au003e and u003ca href=u0022https://amzn.to/40Wijccu0022 target=u0022_blanku0022 rel=u0022noreferrer noopener sponsored nofollowu0022u003ecumin seedsu003c/au003e, while sambar powder has less black pepper and more fenugreek seeds. The flavor profile is different yet similar.