Yes all true about it being Scottish Regiments and there is a link between the two Reels.
The Kandahar Reel (The Duke of Rothsay's Kandahar Reel) was devised while the Black Watch, 3rd Division The Royal Regiment of Scotland were serving in Afghanistan in 2009. Two officers Capt. Andy Colquhoun and his cousin Lt. Rob Colquhoun devised the reel. Coincidentally Major Ali Hempenstall a grandson of one of the men in The Highland 51st Division, who devised The Reel of the 51st Division,( originally called The Laufen Reel for 5 couples) in World War II , was also a serving within the Battalion in Kandahar during the summer.

See http://my.strathspey.org/anselm/stories/reelofthe51st

I have danced both Reels and they are so much better danced with exuberance in an all male set.