Dwarven Hammer and Tight Knob question

I viewed the schematics for various pedals with Tight Knobs like the Thermionic OD or the Tight Metal and I saw that it is a high pass filter placed between gain stages. The question is how similar is it to the Dwarven Hammer's attack control? Which seems to be the same, except that it varies the cap value instead of the resistor value and it is placed in the feedback loop. Is it possible to replace one with the other?
 
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