I'm about to replenish my supply of Hydroquione purchased from Photographers Formulatry. To purchase it locally I can shop at Adorama but they list Photographers Formulary Hydroquione as Residual Hydroquione. I cannot find Residual Hydroquione at the Photographers Formulary site and wonder if I may be getting something I need to adjust my formulae for?

What is the difference between Residual Hydroquione and Hydroquione?

Are adjustments in usage necessary?

Any idea which way? How much?