The influenza virus and the WuVid virus are comparable in size (influenza 0.08 to 0.12 microns, WuVid 0.06 to 0.14 microns) and we are talking about mechanical and electrostatic governed filtration. I think we can safely say that there would be no difference in the size and behavior of the microdroplets created by human respiration relative to either virus as well as the comparable size would likely mean no difference in the mechanical filtration methods. Masks should be as effective against one as the otherIf coronavirus is substantially more virulent/spreads better/has a higher r0 value compared to flu, however you want to say it, then practices that are reducing flu spread to near zero may not contain coronavirus.
An analogy would be wearing a mask that stops large wood chips but allows the tiny sawdust particles through. Wood chips in this example are flu.
And I am definitely not saying cloth or paper masks work for the pandemic, it should be obvious from the continuing spread across the country they do not.
The R0 for WuVid is 1.5x to 2.0x that of influenza, a significant but not major difference that would be seen most likely in the effectiveness of social distancing
Neither difference supports arguing that methods that empirically are not slowing the spread of WuVid much can be given credit for drastically decreasing the spread of influenza. Masking and social distancing logically should reduce WuVid in lockstep with influenza based on how the effects are thought to be obtained. The data does not support the conclusions