Coast Redwood needles look more like a fir tree - flat and extending from a central spine. Coast Redwood cones are about the size of a small marble, about the diameter of a fingernail.
Giant Sequoia needles look more like cypress or juniper - strings/ropes of needles. Giant Sequoia cones are about the size a large chicken egg yolk.
Dawn Redwoods are native to China, previously thought extinct and only recently (1940s?) discovered to be living. Their leaves look more similar to Coast Redwood. I have no idea how common they are in cultivation/landscaping.
Forgive the hotlink...to an image [0]. Image Source [1]
[0] https://landscapeplants.oregonstate.edu/sites/plantid7/files...
[1] https://landscapeplants.oregonstate.edu/plants/sequoia-sempe...