There's the PSAT; there's the SAT; there are even a few other assessments, as it turns out. There's a lot of jargon out there when it comes to the tests offered by the College Board. It's important, then, to know exactly what you're signing up for—and how each test is different.
The new SAT suite of assessments is designed to work together. All of the tests are fundamentally similar, and you can use any one to prepare for any other. That being said, PSAT vs. SAT isn't a perfectly equal matchup: there are some differences—major and minor—between them.