Hm ... I called the warranty department yesterday, and they said that Asian fit and Standard fit Path lenses 
are interchangeable, but arab_pete seems to know what he's talking about, and just looking at Oakley's product images inclines me to believe him:  
 
Standard Path:  
 
 
 
 
Asian Fit:  
 
 
  
 
Notice the different shapes -- the Asian fit lenses seem to tuck closer to the frames near the hammerstems.  It's similar to the difference between Hybrid and Sweep lenses for the M-Frame.   
 
@arab_pete: do you have both sets?  How do you know that they don't fit?