I wondered the same thing when I assembled my engine. They look identical but I used the 6.7l cooler and 5.9 filter housing on my 6.7 block and have no issues. I heard the filter housing side was interchangeable but block side was not. I wish I'd actually looked at them side by side.
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06 Dodge Ram 2500 6.4L, Wagler +.080 rods, Hobbit tuned, Exergy150% injectors,Polished s475/87 1:0 A/R Engineered Turbo Billet Wheel,arp625s,14mm main studs,PPE dual fuelers,Hamilton 188/220,extreme pushrods,Fleece bypass/drains/distribution block,110#springs.
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