Are these coco bricks the same thing as canna coco basically?

Yes.

Yes it can be, just make sure you got a brand that u trust on washing and buffering it the right way. Im having good results with Plagron and bad ones with Bionova.

Well yes and no. Canna coco, well some coco is made for weed and has stuff to combat disease. I used ones more or less like that, mine said machine washed. It's very hard to break apart but yeah it's the same.