No transistor is Equal. every single one has it's own traits and there are hundreds to thousands of different transistors.When you are choosing a transistor you will want to be sure you got something suitable for your current purpose. is it a PNP or NPN transistor? Can it handle the voltage it may have to deal with?? Can it handle the current?? and so on.Remember: Component Datasheets are your best friends. they tell you everything you may need to know about a component!!