Well here I pulled out my Williams New Haven F3 and my Williams ACL F7 Because they have the brighter paint schemes to see detail. I see that the windshield has dropped on the F3 but I like the F7 in the comparison. The F7 has more detail like rivets, flush porthole windows and a steam generator as well as better cast horns. The F7 has a very smooth nose and the F3 has add on nose grabs metal ladders and roof mount metal brake grills
Really they are both F3 models but the Kusan is a later full side metal grill model while the Lionel based version is a so called Chicken wire grill model.
The Kusan is a little bit taller while the "Lionel" is a little wider. They share truck castings, pilots and I think motors.