This question is a bit tricky, as it depends on what "MB" is referring to.

Here's the breakdown:

* MB (megabytes) is a unit of digital storage. It's commonly used in computer science and data transfer contexts.

* MB (millibars) is a unit of pressure, primarily used in meteorology.

Therefore, MB does not equal MB. It is important to specify what you mean by MB to avoid confusion.

To be clear, you would never use MB for both digital storage and pressure in the same context.

Let me know if you have more questions about specific contexts!