Are the SA3 letters critical too? I assume the DC means you need a diode?
 

Yes the DC means with a diode - when a DC coil de-enrgises it induces a back spike of voltage and the diode prevents this from finding it's way back into the driver circuit.

I've read the pinmedic site and other places where it says the first bit of the coil desigantion is for the physical arrangement. I've looked at "a fair few" and they all look to be wound on the same former to me. I looked pretty hard on my Flash ones because I stripped the wrappers off and scrubbed and cleaned them before rewrapping them. The only differences I've noticed are that drop target coils tend to have the diodes mounted on the outside end ie the other side to the winding, most others seem to have the diode on the top side closest to the coil windings.  If I had to guess I'd say maybe someone is kidding themselves it's a vibration idea .....

It doesn't show that well but in the picture the middle coil has the diode on the top side the left coil which looks like it has no diode actually has the diode on the outside to the left of the picture if that clarifies what I've said above

If it physically fits, which I reckon all will,  I'd say it's ok.  JD, all else being equal I'd go the 23-850 from your list.