After you install the Infrastructure Update for Project Server these are the versions you will see on the client.
In IE you will see these two ActiveX controls:
Control Version ID
PJ12ENUC 12,0,4518,1014 {D5B680E5-9C5F-45E0-A97C-521D4F281173}
PJAdoInfo4 12,0,6320,5000 {E3089160-E8AD-4C5B-B47C-ADDF3DF660DD}
In the Project Professional version in Help | About: 12.0.6318.5000 SP1 MSO (12.0.6218.1000)