Tweed vs BF tone stack signal loss?

[Groover]

I think I have seen discussions relating to this, but couldn't find the threads easily, or else they don't address this as specifically as I recalled...

How does the negative gain compare between a 5F2a (eg.) tone stack vs the Blackface TMB stack at higher settings of the midrange knob?

and..

Does the 5F6 cathode-follower tone stack have less neg. gain that the BF stack?