No, layer pellets are usually 16% protein (that isn't high) and about 2.5% fat. They are almost always vegetarian feeds.
Calf manna has 25% protein and 3% fat. It doesn't have any animal protein. The main protein comes from dried whey (4th ingredient), dehydrated alfalfa meal (5th ingredient), linseed meal (6th ingredient) and brewer's dried yeast (7th ingredient). It's about $30/50#. 1 Tbsp pre chicken per day is recommended for supplement.
I still prefer animal protein when trying to grow feathers.
There is a layer feed that is called feather fixer and is pretty good for the purpose.
I have to ask @Gearmpr
, since you asked about layer pellets being high in protein, what normally makes up your chickens total intake?
Feed (protein %), scratch grains, table scraps, etc.?