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Lexus factory keys are shaped the same, the master key is black and the valet key is gray. On Toyota's, the master is squareish. There may be other variations for some models but I don't keep track. A picture would help.
Both look to have a master cut on the blank. easy way to tell is locking the accessory/glove box or interior trunk release button. If both keys do that, they are both master cut keys. Technically, the ovalish one would be the valet shape.