Umm... no.... there are huge difference in quality. No doubt.
For waterpump, you should be okay with local parts... waterpump, pulleys and belt. Graf is the best and OEM waterpump. Anything else is a crapshoot. It is a good thing to replace everything related to the job... especially the pulleys which everyone ignores.
Lemforder is best for suspension and steering parts. Boge and Bilstein Febi is good. Meyle HD (Emphasis on HD) is supposedly very good... I am still on the debate of regular Meyle stuff for steering.
Online is always the best deal so plan ahead when you want to repair something.