difference between 860246A15 and 860246Q11

[JohnEGraham]

Does anyone know the difference between 860246A15 and 860246Q11
They both have the saltwater type coating.
I have the Mercruiser 1998 5.7 ( 350 Engine)
Thanks
John G

Amazon.com: New Mercury Mercruiser Quicksilver Oem Part # 860246A15 Manifold Kit : Mercury Marine: Automotive

Amazon.com: Quicksilver 860246Q11 Exhaust Manifold, Port or Starboard, MerCruiser, V8 305, 350, 377 : Automotive

 

[Scott215]

I doubt they are real mercury parts that cheap. I haven't seen them lower than 500 each