In a word: nope.

From what you've said, apparently your problem is that you're viewing the condition as a mathematical equation, with SettlementBuildingFinished as a variable, but that isn't the case. SettlementBuildingFinished is a function and the rest of the condition are parameters. Go read the Events, Conditions, & Commands thread for further info, although to save time I'll copy the SettlementBuildingFinished info here...

Identifier: SettlementBuildingFinished
Trigger requirements: prior_build
Parameters: building description, logic token, test level
Sample use: SettlementBuildingFinished = governors_house
Description: Test to see what the last finished building was
Battle or Strat: Strat
Class: SETTLEMENT_BUILDING_LEVEL_FINISHED_TEST
Implemented: Yes
Author: Guy

From the Parameters and Description we can see the intended use and intent of the condition and from testing we can deduce how it operates: the function first compares the completed building with the test building parameter to determine if they're in the same building tree, if they are it then compares their levels using the logic parameter, returning true or false as appropriate.