"Scots Cavalry choices or lack of ?" Topic

Having just read the chapter on cavalry in the excellent book Scots Armies in the Great Rebellion1638-1658 by Stuart Reid as recommended by KYPD it seems there are just 3 cavalry types .
Because of the period I am doing ie Marston Moor period of 1644 ,I actually only appear to have 2 choices as one came after the period I am doing these are
1) Lancers
2) Dragoons or dragoon looking
3) Moss Troopers .Not suitable for my period.

So if my understanding is right ,I need to basically collect 2 types of cavalry for my Epic Scots arm of my army ie the lancer and the dragoon.

The line in the book that kind of confirms this is as follows . This is from page 54 "………….throughout the wars it would appear that latterly the only real difference between horse and dragoons in the Scots armies was that the latter may not have carried lances!"

So based on the above is my understanding correct here ?

Assuming that is the case did these "dragoons" fight as dragoons or more akin to mounted cavalry firing salvos of musket shot ?
Therefore in the Epic rules should I be following the rules for mounted cavalry armed with carbines?

Thanks

There is a third type- pistol armed medium/heavy cavalry. due to a poor horse supply in Scotland they were generally beaten by their better mounted English opponents. As a result the lancers, who were cheaper to equip, became more prevalent, especially after success at Marston Moor. The pistol armed horse still showed up in the campaigns of Montrose. The "Moss Troopers," in my understanding, were a mixture of all three types depending on circumstances. They were akin to the Missouri/Kansas guerillas of the ACW.