Thanks Bryce it’s just I see illustrations for line cavalry heavy to light with leather strap and varied coloured wool knot and tassle per squadron number.
Whereas the guard cavalry regiments appear as having just all red leather(strap/knot/ tassle) and no other colours at all
The best online source, courtesy of the 'Wayback Machine' is probably Jonathan Gingerich's old site (currently off-air): https://web.archive.org/web/20190302113230/http://zaotlichiye.net63.net/allfacings.html Search on 'Cavalry Swordknots', well down the page. Other Guard Cavalry details are contained in the relevant section.