Head Cylinder part Number CONFUSION

[Maromix]

Hi All,

I have a 1994 Porsche 3.6L (964)

A seat valve fail so we want to change the Head, at the actual unit the part number is 964.104.297.5R but at the E_Kataloge the part corresponding a M64.50 Engine is 964 104 033 21

So do I have the wrong parts installed on my card before I got it? Is this an Upgrade made?

Please help...