Stop with the APT mythology
The biggest fail people make with APT is calling it a name and treating it any different to other forms of security compromise.
The threat is military/industrial espionage, which is basically infomation theft and the vehicle is accessing your networked computers.
Thats your commonality, there is no other commonality.
Therefore of course the same MO and the same toolset at play.
The day someone dreamt up "APT" was the day we started loosing focus and loosing the war.