Stock rocker shaft oil hole orientation

Just noticed one 2 different sets of rocker shafts, the oiling holes and orientation notches are completely different. Whats up with this? Seems like the rocker shaft on the right is drilled completely wrong as the wear pattern is completely offset from the oil hole. Could the shaft on the right be original mechanical cam 273 shafts? They only have one set of small oiling holes.

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