Dyna S is an ignition system sold by Dynatek. It is not a coil or coil-type. Dynatek also sells coils that it recommends for use with a Dyna S ignition. Those are usually the full-size, green, 3-ohm coils.
Those green coils will work with points but are not generally recommended for points. The higher current tends to shorten the life of the points.
So the question is, do you have a Dyna S ignition to go with those green coils, or are you using points?
The Dynatek coils are generally regarded as very reliable, so if you want a matched pair, buying a replacement might be cheaper than a pair of stock coils, provided you are using a Dyna S ignition.
The Dyna S will work with the stock, black, 4-ohm coils that came with the bike. If you can get new ones of those, they tend to be less expensive and work well. Obviously they will also work with points.
One thing people often do, that prematurely kills a coil or ignition module, is try to turn the motor over while the spark plug wires are disconnected. If a path is not given to each plug wire while cranking, a coil or igniter can be damaged,
