There were about three different kinds of S+ hoppers manufactured by IGT that I know of... with different wheels
and optic switches ( some semi-mechanical), but they will all work in any S+ cabinet.
They all run on the same voltages and use the same mount plates and beau plugs for electrical connections.
You don't have to change the optics switches on any hopper...any will work just fine for any hopper.
If the coin denominations are the same size for all your different S+ cabinets and games, you don't have to change anything!
The only time you change the deck top coin drop in slot guide, the CC sample coin, hopper wheels, knives, and the coin-in optic guides are when you're changing the denomination of the coins that are used from like a quarter to maybe a nickel or vice versa.
The physical differences in the size of everything has to be swapped out.
Now, you're talking the deck top coin drop in slot head, the coin-in optics guide ( also known in the biz is the "coin-in encoder") that's sandwiched between the twin coin-in optics boards underneath the coin comparitor.
The diameter of the quarter is far larger than a nickel coin and will only get jammed...it don't fit through.
If vice versa, the nickel in a quarter or larger denominational coin guide will fit through but miss the optical eyes
and cause mis-reads when dropping in the smaller sized coins.
You'd also have to change the sample coin in the coin comparator ("CC") as well as the hopper shelf wheel, the hopper knife too.
Why the hopper knife?
The nickel hopper knife has too high of a profile to guide the quarter through the hopper optics correctly plus
it's just a little bit shorter than a quarter knife as the wheel shelf of the nickel wheel is a little larger in diameter.
The quarter sometimes hits the top of the optics and falls off the knife or jams under the knife itself!
So, basically, try to keep the same coin sizes and denoms in all of your S+ machines...avoid using dimes or pennies. They only cause headaches as they like to jam up under the knife.
Especially if you want to be able to swap out coin parts like your S+ hopper for trouble-shooting purposes, without changing everything.
It just makes everything much easier and less costly...parts-wise.