differance between a 4cyl knuckle + bearing an 6 cyl knuckle + bearing on 1999 Toyota Camry

have both type knuckles here and they a are exactly the same but the bearing kits have differant part numbers for 6 and 4. Are the the knuckles all the same and just the bearing types are differant because the out side dia. on the bearings and the new hub shafts are the same size

Asked by for the 1999 Toyota Camry