Kops,
The Oyaide Tunami and Acrolink are really quite different.
The Tunami features a palladium over gold plated plug.
The Acrolink is rhodium over silver.
Purity of the copper used in the Acrolink is higher for the hot and neutral. Stranding is .26mm X 100 strands
The Oyaide uses ultra pure single crystal copper, but only in the ground. Stranding is .32mm X 69 strands
They are seperate companies but do share technologies and processes such as plating of plugs. Acrolink, however, only makes one plug which is the carbon fiber series. The plug that you see on the Acrolink 6N-P4030PC is most likely an Oyaide plug but with the Acrolink wire.