I think so, because on my main account I have a TW client registered and am not able to access that account using my NA client while I successfully created a TW account on my 2nd account (which did not have TW client registered, only ANZ/NA)
Even the smallest donations help keep sc2sea running! All donations go towards helping our site run including our monthly server hosting fees and sc2sea sponsored community tournaments we host. Find out more here.