If you use the Touch object, it emulates the mouse.
In that case, using any "On touched" or "Is touching" condition will be the same as using a "On object clicked", "On mouse button down".
You cannot determine exactly what mouse button you are using , for that you ARE to add and use the mouse object to your project and use the appropriate condition.
But for a general "user input, either using touch or mouse", the generic Touch input is enough and does not require any extra condition.