Super Saiyan Blue, also known as Super Saiyan God Super Saiyan, is a form that combines the power of Super Saiyan God with the first Super Saiyan form.
This form can be accessed by absorbing the powers of a god and then simultaneously activating them while transforming into a Super Saiyan, or through vigorous ki control training with a deity with godly ki and then obtaining that Godly ki for oneself, as seen with Vegeta in the Super anime. The god ritual is in other words not required, but it is the easier path to take. This form surpasses its predecessor, Super Saiyan God in power.
In contrast, the Super Saiyan Rosé form is the result of a truly divine Saiyan transforming into the first Super Saiyan form (in the Dragon Ball Super anime and the Dragon Ball Fusions video game) or the divine counterpart of Super Saiyan Blue (in the Dragon Ball Super manga and most other Dragon Ball media ).