HI Naomi !
I can confirm this, that Points and Answers received in
http://answers.microsoft.com/ forums are not shown in MSDN / TechNet branding. They are using Different Profile System and Recognition method. I hope in future they will merge these with MSDN / TechNet branding.
Apparently there is no option to search User Name like we have "Browse Forums Users" like we have in MSDN / TechNet branding.
Please let me know if this doesn’t work for you. Hope I have answered you correctly.
Thanks, Hasham Niaz