Just Cause 4 vs Just Cause 4 Reloaded

I may sound extremely stupid in this post, and that is not entirely untrue. Here is my question anyway:

What is the difference between Just Cause 4 and Just Cause 4 Reloaded? I just finished JC3 and would like to get JC4. I heard there were some issues in the first release, and the developer made a big patch. Is that what Just Cause 4 Reloaded is? Just a fixed version of the original?