What's the difference between GTA4 Liberty City Branch and GTA4?

The original GTA4 and the expansion GTA4·EFLC (Chapter of Free City) are the same gangster career in the same city with different roles from different angles. They were inextricably linked before, and the stories were intertwined. Only after all the original works of GTA4 and GTA4·EFLC (a chapter of Free City) have been performed, can we understand a complete story. The protagonist of GTA4 is Nick, an immigrant from Eastern Europe. The two protagonists of GTA4·EFLC (the chapter of Freedom City) are Johnny, the second leader of the local wild one, and Louis, the partner and spectator of the city nightclub. Although they have different backgrounds, because they are all in Liberty City and involved in gang affairs, their fate is linked ... If my answer can help you solve the problem, please choose "solvable" and "original" to adopt, if not, please continue.

I'm not talking on paper. This is a screenshot of my game, and I refuse to quote it-I was told to play GTA4 screenshot and I played GTA4 EFLC screenshot.