You are welcome.
Failing anyone [Stephen?] finding better/more accurate information it would appear that the regiment you seek is:
The Kaiser Chevauxleger raised 1688 as dragoons. Became 1st Chevauxleger Regiment 1769 [Colonel was Joseph II], became 1st Light Dragoons 1798-1802 [because there was no dragoon designation then, 'light' was dropped but still used, Knotel confirms Light Dragoons] and then 1st Chevauxleger again 1802-1815.
During the Seven Years War the designation of Austrian cavalry was: Dragoon's, Cuirassier's, Hussar's, Horse Grenadier's and Carabineers detached from the Dragoon Regiment's [Knotel has one list of Dragoons, no Chevauxleger, for the Seven Years War].
This is another link:
Hope this helps.