It does matter in terms of how much less polluting it would be. Even in case of coal plant bonansa it reaches a point where it becomes less poluting than gasoline car . Alghtough much slower. Its also not realy important since renewables became so cheap that there is practicly no country that dosent have a fairly significant renewable share ( and by that i mean > 10 % ).
Also 24% nuclear and 3 hydro which somehow dosent count as renewables