Is Lester Crest from Grand Theft Auto 5 Supposed to be Zero From Grand theft auto San Andreas?

As soon as I saw the character in a cutscene of GTAV I noticed he seems to be a 'nerd' with glasses. And he somewhat talks like somebody I've seen in previous GTA games. I've thought to myself "is that meant to be Zero from grand theft auto san andreas?". I've been online and searched for the answer, but I found nothing, so if anyone has sources or know the answer could I please know?...It's really bugging me.

Rockstar has addressed this before. Check the Other Characters section of this GTA III Q&A.

El Burro is referenced as he was also referenced in GTA 1, so it felt appropriate that he should cross “universes” – the “universes” are the worlds interpreted at different definitions, 2d, 3d and high definition, so we felt brands and radio / back ground characters would exist in both, but 3 dimensional characters would not. This is the logic (as far as it could be considered logical) behind it – so no, we don’t believe any GTA3 characters could exist in the GTA4 universe.

As the quote says, the GTA series has been rebooted twice.

2D Universe: GTA/GTA London (1969/1961)/GTA 2

3D Universe: GTA III/Vice City/San Andreas/Advance/Liberty City Stories/Vice City Stories

HD Universe: GTA IV/Episodes from Liberty City/Chinatown Wars/GTA V/Online

Zero is a 3D Universe character, and Lester is an HD Universe character. They don't exist in each other's universes, so they're not the same person.

I don't think you're going to find any sources that say "Person A is not Person B". It kind of goes without saying. It sounds like they are just using a similar character archetype.