The primary difference is the choice of p-aminophenol base vs.
p-aminophenol*HCl. Usually the aminophenols and similar developing
agents are prepared as the acid salt... for instance, p-aminophenol
hdyrochloride, Metol, etc. The acid salts are very stable in powder form
compared to the free bases, and the acid salts are soluble in water.

The Anchell formula I have is quite different from that which you
posted. It is:

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Rodinal-type Developer

This formula is very similar to Agfa Rodinal. Rodinal is the oldest
proprietary formula in use today, the original formula dating back to
the 1880s. It is considered by some to be the finest all around film
developer, even for modern T-grain films.

Solution A
Water (125°F/52°C)             750.0 ml
P-Aminophenol hydrochloride         100.0 grams
Potassium metabisulfite         300.0 grams
Cold water to make             1 .0 liter

Solution B
Sodium hydroxide             50.0 grams
Cold water                 100.0 ml

CAUTION: When the 50% solution of sodium hydroxide is being made up,
heat is generated. The solution must be cooled before adding to the
developer.

Allow Solution A to cool. A precipitate of p-Aminophenol hydrochloride
will form. Slowly add, drop by drop, Solution B to Solution A until the
precipitate almost disappears. Do not dissolve all of the visible
precipitate! Leave a few crystals undissolved (as few as two or three).
---------

Actually, the precipitate that is formed is the free base, which is
ionized by base and goes back into solution.

This is another preparation for Rodinal which I pulled from an old
forgotten reference:

-----------
Rodinal Preparation:

Boil 250 ml water, cool to 125F, and add a few crystals of potassium
metabisulfite, followed by 20 g of para-aminophenol hydrochloride. After
the para-aminophenol-HCl dissolves, add 60 g potassium metabisulfite,
and stir until dissolved. Then add a solution of 40% (w/v) sodium
hydroxide which thickens the solution as the para-aminophenol base
precipitates, and then goes back into solution as the phenolate anion as
more sodium hydroxide is added. Stop the addition of sodium hydroxide
while there is still a small amount of precipitate left, and add water
to make 400 ml. Set aside to cool, and place in a glass bottle. A small
amount may come out of solution, but the addition of sodium hydroxide
will dissolve it. If there is no precipitate, excess sodium hydroxide
may be present, and a saturated potassium bisulfite solution may be used
to neutralize it. (The amount of 40% sodium hydroxide required is approx
70 ml.)

A small amount of precipitate is desired, since this occurs at the
lowest pH at which the para-aminophenol is in solution. The addition of
more base results in a higher pH at which the solution oxidizes more
rapidly.
----------------

Again, a small amount of precipitate is left in the solution, In a way,
the solubility of the base in the alkaline solution is being used as a
pH indicator to insure that an excessive amount of hydroxide isn't
present, that would give a very high pH and short shelf life. When I
used commercial preparations of Rodinal I transfered them to a glass
bottle and titrated them with bisulfite until the a few crystals
precipitate formed. I started the practice after Agfa changed the their
preparation (more basic - no crystals).