Differences in Early Rat Sounds


Can anyone comment on the difference in sound between a Tone Knob and a Filter Knob Proco Rat?
I'm only really concerned with 79-81 pedals - so no need to go into the differences between newer models.

Is one just the reverse sweep of the other?
I've read that early '79 (Fringe Logos) have Tantalum caps.
Would this make any real discernible difference in sound?

Thank you for any advice!

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