Every line regiment had 2 companies of grenadiers, which are formed together with 2 other companies to one bataillon.
E.g.: The Silesian Grenadier Bataillon was formed out of the 1st and 2nd Silesian Regiment.
So grenadiers are also Line Infantry
Leibinfanterie Regiment is Line, its justanother namefor the 8.Regiment(1. Brandenburgisches)
+1.
The'ye got the additional name because they defended Colberg.
Like the 2nd Pomerian Regiment, which got the additional name Colbergsches Regiment.