Is MERN just React for Angular?

First off, thanks for creating this! Very excited to see a React full stack solution.

Is it safe to say that this stack is just trading out Angular for React?

I found that to be a little difficult to reason about simply, given how much bigger and encompassing of solutions that Angular is to React.

What are some of the factors included to make this a full solution vs MEAN.

Redux? Relay? React-router?

Im just trying to gain a granular understanding. Thanks!