There is a significant difference in consistency, color, and many would argue quality, between hash rosin and flower rosin.
Flower rosin is created by using heat and pressure ( a rosin press ) to squeeze rosin out of cannabis or hemp flower. The consistency, color, and quality of rosin regardless of the type of starting material depends highly on the quality of the starting material. With that said, the rosin that results from pressing flower is typically darker in color with more of a ‘waxy’ consistency.
On the other hand, rosin pressed from hash tends to be much lighter in color with a budder-like consistency that is much softer. There is no question that hash rosin is the more desirable concentrate and it is generally true that hash rosin will have better effects and flavor. For this reason, it also tends to come with a higher price tag as well.