Jisho

And also please give an example with "mousugu" as well. What is the main differences between two of them?

Here's a blog post comparing them with a bunch of examples.

https://nihongonosensei.net/?p=11357

The TLDR is, they're effectively the same except when そろそろ means 早く. In that situation, you cannot use もうすぐ with the same meaning.

そろそろ時間になりました。It's about time。

もうすぐ時間になります。it's almost time。

もうすぐ時間になります。it's almost time。