The company that I'm logged into in MR, whether that company has "-Curr" or not, is indeed configured to use Z-US$. It's a US-based company.
I guess I just need to know if it is essential for me to login to a company that has "-Curr" at the end of its ID, if I'm using the Legacy Adapter. It seems to me that my reporting generates accurately, if I log in to a company without "-Curr", as long as the tree's company IDs contain "-Curr".