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Not true. It depends on when it was produced. My WL is 2005 has the 190kW engine and was grey.
The ways to tell are - in an auto, as described, will have 5 speed. The shift options on your selector will say D, 4, 3, 2 rather than D, 3, 2, 1(or L). There will be paddles behind the top spokes on steering wheel, small ones, with a + or - symbol.
Engine covers should state Alloytec190 as opposed to Alloytec (unless changed) as will side badges on fenders with indicators (sometimes)
The engine itself will have 2 electrical connections at the rear of the plenum, one will actually have a black circular mechanism attached to the plug, this is the variable intake.
The intake pipe itself on 190s at the front of the engine will have long plastic resonators extending toward drivers side of the car originating from under the intake pipe, almost extending to the battery.
Generally engine numbers on 190kW start with 10H7, also, on your compliance plate in engine bay, the 190kW engine has a designation of LY7, whereas the 175kW has LEO.
That should help