can the new wallet run right next to the old one on the same p00tr? (is the roaming folder name same?)
Roaming folder is different,
Legacy : %appdata%\Whitecoin\
V2.0.0 : %appdata%\whitecoin-xwc\
Ports are the same so you might change the Legacy Whitecoin.conf to (example)
listen=0
port=15816