The two of them have applied in SEDO signature campaign last month, as you can see in this spreadsheet.
I'm pretty sure john-connor's account is either bought or hacked.
There is a two-year post gap between November 15, 2016 and September 12, 2018 and his first post after waking up is twitter bounty report.
Posts made from 2014 until Nov 2016 are made in English (no bounties).
Posts made from September 2018 until now are exclusively in Russian (many bounties).
Given the number of available bounties to join and the fact that they have enrolled several times with very similar email addresses in the same campaigns, it is almost 100% conclusive that they are alts of each other.