the important thing is that they increase the blocksize and add other few interesting things.
Fun fact: Neither one of those teams have developed anything worth incorporating into Bitcoin Core. Don't get me started on idiotic ideas such as "header-first mining". 
I don't know but check this: https://ww.reddit.com/r/btcfork/comments/53tfnb/hfp0_an_early_prototype_of_a_bitcoin_hard_fork/