I bought a TFWPKY 1969 thinking that the 331 attack and the slight impact buff would make more damage than the Fatebringer, but it doesn't. The glorious Fatebringer is still making more damage (due to the explosive rounds).
I'll add some data soon.
I've tested them through the 2nd, 3rd and last parts of the CE raid.
Please, feel free to add some relevant info/data.
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ALL weapons only do 300 on level 30 stuff, you need 310 for 31, 320 for 32, and 330 for 33. Take em both into CE hard where the enemies are 33, and you will see the difference.