Confusing daylight running lights.....?

[f_399]

outer= near the signal lights

inner= closer to the grills i think they are the brights

 

I see some luminas/ montecarlos where the drl run from the inner lights

 

then I see others where the DRL's are running from the outer lights...

 

is there a difference in the year the car was made? my DRL run from the outer lights.