1- the order of the schools in the allocation letter was different from my order when I registered my child. I had changed the order within the time limit but BCC took in consideration my first list. Does it matter since there are no places available in either schools?
No, it doesn't matter now. You can re-state your (new) order of preferences if you want to go on the waiting list for both schools.
2-"no places available": does that mean that the BCC has allocated places in thoses schools and there are no places left? or does that mean that there were no places available to start with?
There were no places available to start with - the year group was full.