Are the blocks in blkxxxxx.dat files ordered by block height? I'm parsing out de blockxxxxx.dat files for the bitcoin blockchain. Are the blocks ordered by height? So is the order of the data for everybody the same?
No, they are in the order by which your node received the blocks. This can be in any particular order as nodes receive blocks out of order during the initial sync. Furthermore, some nodes will receive and store blocks that become stale, while other nodes (particularly ones that come online after that block has been found) will not. So the blk*.dat files between two nodes are likely to differ.