no they are related but are different but are all members of the crow family which include magpies jay and chough i am sure a collection of crows is a murder regardless of sizeI honestly did not understand your earlier post which started "look"
am I wrong in thinking although all are corvids, the Crow/rook/raven/jackdaw are all quite diffrent?
Jackdaws we seldom see except in the towns, I have never seen a rook or a raven in my locality.
I have seen rookerys,outside my localle, and as I said, these crows behave in the same way, there are hundreds at dusk I wasnt sure what a collection of crows this big was called when roosting together.