IT all comes down to what you want to do with the truck you are planning to install the 60 into basically.
Kept stock with stock or (SLIGHTLY) larger than stock tyres, mild off road or fire road use and not lots of mud and crap then; a good rebuilt ball joint front diff with proper grease and maintenance will work just great.
Modding the truck or planning to mod the truck with big tyres 37"+ and going nuts running bogs and wicked hammering off road loaded and extreme service; I suggest a fresh KP 60 with proper maintenance and grease regularly then and that should last a long time.
As for the 95-97 knuckles fitting another diff...why..why not just use that diff?
If you want the gotta have badass front diff....super 60 from F550
I believe IIRC it has 1/2' thick 3 1/2 dia tubes big ass unit but it's a 10 bolter...though that can be converted. And it is Unit bearing
which I do not like, it is ball joint which I do not like, yet it is one tough unit
Oh ya you can get some aftermarket C's for building a wicked tough 60
As for Cough
gm/chev
cough KP knuckles on a Ford, yes it's doable....not really worth it though. You have to change from the knuckle out complete outer stub axle included! YOU do not gain anything worthy of the upgrade really. Maybe slightly stronger knuckle and IIRC 6 bolts retaining spindle instead of 5 but that's a marginal change for the amount of work. Stick with Ford parts...you can rely on getting what u need in a break down and don't have to cobble together parts. KISSS theory applies here!
JM2CW on the subject....