Configuration Notes:
Notes on using WinCC/Web Navigator client with a different version of WinCC/Web Navigator server are available in the following documentation.
The functions of the server used are supported.

WinCC WebNavigator V6.0 and V6.1: WinCC Web Navigator - Release Notes/Important Information/Web Navigator Client on Web Navigator Server V1.2

WinCC WebNavigator V6.2: WinCC Web Navigator/WinCCWebNavigator - Documentation/Requirements/Combining and Compatibility of Versions
Entry ID WinCC V6.2: 25842925 (click on "Info")
Entry ID WinCC V7.0 and V6.2 SP2: 29489481 (click on "Info")

WinCC WebNavigator as from V7.0: WinCC Information System/Options/WinCCWebNavigator/WinCCWebNavigator Installation Notes/Requirements/Combining and Compatibility of Versions
Entry ID WinCC V7.0and V6.2 SP2: 29489481 (click on "Info")

Note:
The compatibility is tested for the last available Service Pack of the version concerned.