..., are both modifications of the original. 
so that means the original bitcoin is gone (?) 
so that means the original bitcoin is gone (?) Your not the first one to ponder over questions like that: https://en.wikipedia.org/wiki/Ship_of_Theseus
After lurking for a while I have found that you get more political and ideological based answers than scientific ones (maybe not in in the more technical oriented subforums). So I suppose you could just make up your own mind on what is an "altcoin", if any, of those two. It is really not more than a label anyway.