Differences between Non Site Server and Site Server

Hi guys,

Could you tell me what is the difference between Non Site Server and Site Server and when to use each upgrade option ..?

Agents / Plug-ins -> Symantec Management Agent -> Windows -> Non Site Server

• Symantec Management Agent for Windows x64 (Non-Site) Upgrade to 64-bit Symantec Management Agent 7.5
• Symantec Management Agent for Windows x86 (Non-Site) Upgrade to 32-bit Symantec Management Agent 7.5
   

Agents / Plug-ins -> Symantec Management Agent -> Windows -> Site Server

• Symantec Management Agent for Windows x64 Upgrade to 64-bit Symantec Management Agent 7.5
• Symantec Management Agent for Windows x86 Upgrade to 32-bit Symantec Management Agent 7.5

If set all there is any risk ..?

Thanks.