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!!
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No BC187 is a PNP transistor and BC547 is a NPN transistor.
They are not even complementary transistors the complementary of BC547 is BC557.
You can get the datasheets here.
Simply compare the datasheets or ask my good old friend Google for BC547 alternatives.Since it is a more than common type you have a few hundret replacement types you can use that all do the same within certain parameters.