Same sign 1
They all use Crex24 for listing: MalwareChain, Sin, SafeCapital, Streamit as  there first and primary exchange.

Same sign 2
They also list all this scamcoins at the same masternodes monitoring site ASAP after anounce. (I will not advertise this site here, because I do not support projects that for money help to scam people. If you work with masternodes you know this site).