I am not a Porsche engine builder by any means, but the VW stampings have no relation to wieght on thier rods, just a way to tell them apart and match the end caps correctly.
The most important part is getting a heavier rod than what you have now and shave the heavier rod down to match the others. Within less than a gram of each other... If you get a lighter rod then you have to shave 5 instead of 1
