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OO3 Pro is com.omnigroup.OmniOutlinerPro3
OO3 is com.omnigroup.OmniOutliner3

I'm not sure it's the best way to do it, but the following worked for a proof of concept:

Code:
set appID to "com.omnigroup.OmniOutlinerPro3"
set hasOOPro to true

try
	tell application id appID
		activate
	end tell
on error
	set appID to "com.omnigroup.OmniOutliner3"
	set hasOOPro to false
end try

tell application id appID
	if hasOOPro then
		display dialog "User has OmniOutlinerPro"
	else
		display dialog "User has OmniOutliner"
	end if
end tell