No, CS2 and CS:GO don't share the same code base. While CS2 is built upon CS:GO's foundation, it uses a completely different game engine - Source 2, compared to CS:GO's original Source engine.

The main differences in code structure come from several key areas:

- Game Engine: CS2 runs on Source 2, which is a modern engine with improved physics, lighting, and networking capabilities
- Rendering System: CS2 uses a new rendering pipeline called "Sub-tick Updates" for smoother animations and more precise movement
- Network Code: The networking architecture has been completely rebuilt for better server performance and reduced latency
- Physics Engine: CS2 implements improved collision detection and more accurate bullet penetration calculations

I can confirm that while CS2 maintains similar gameplay mechanics to CS:GO, its underlying technical architecture is fundamentally different. Valve has rebuilt the game from the ground up, though they've preserved familiar elements like map layouts and core gameplay mechanics.

The new code base brings several technical improvements:

- 128-tick servers as standard
- Enhanced smoke grenade physics
- More precise hit registration
- Better performance optimization
- Improved graphics rendering capabilities

The key reason for this complete code overhaul was to modernize the game and solve technical limitations that existed in CS:GO's aging Source engine. While players might find the games feel similar, they're running on entirely different technical foundations.

This code difference explains why CS2 offers improved graphics, better performance, and enhanced network capabilities compared to its predecessor. However, Valve has carefully maintained the core gameplay feel that made CS:GO successful, even though the underlying technology is completely new.

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