AFAIK aye
We've all patched up the EU client for the last weekend and then repatched using the linked RAR file. Only takes a few mins to get the Tera EU folder copied and then just extract Rar and copy all to your New Tera US folder overwriting whenever it prompts.
Suppose we will only find out come the next US test tho lol
Launcher loads fine and says upto date last time I tried it
Mind if I share with a few members of my clan who want to try TERA again and cba downloading the NA client?