Compatible with what?
I'm not sure , but www.motorcraft.com doesn't list steering knuckles for the 1994 Explorer
Yes.
Provide flexible connection to steering assembly
Any part of the steering system on a car, be it rack-and-pinion, power or not, includes tie-rods, knuckles, steering column coupler, ball joints. Modern cars have electric steering, but still need couplings and knuckles.
Yes they are the same
Yes
Yes they will fit. Note: steering arms on S10 spindles is shorter, this will quicken your steering.
It should be, yes.
NO. They are not even close. Will not interchange.
Any racing games are compatible with the steering wheel.
Attached to steering rack and steering knuckles.
Check out the bearings in the steering column and the knuckles in the steering shaft