Are these two letters the same thing?

FORBES: ECB Secret Letter to Ireland To Be Released?

At precisely the same time, two University of Melbourne scientists published a paper in Geophysical Research letters, studying virtually the same data and finding little significant change.

FORBES: Asymmetric Coverage Of Climate Science Fools Very Few, and It's Not the Koch Brothers' Fault

The two letters had the same postmark, a law enforcement official who had been briefed on the investigation, told CNN.

CNN: Threatening letters to Bloomberg test positive for ricin