there similer, but there different, some use the pt pump like a big cam, some use the p700 pump thats inline, but none of the 6bts come with press fit wet liners like the bigger engines or the water buffalo charge air cooler i dont think a 6bt got the external oil cooler ether but im not 100% on that,..still one hell of a great power plant that can make insane hp when built right!!
I can tell you this. The 6BT makes the Powerstroke (pick one) look like a tinker toy when torn down. There's simply no comparison. The Duraslack isn't even on par with the Powerstroke. Duraslacks look like gas motors torn apart.
