The Hunt for the Ring in UT and RC is as uncanonic or canonic as all the unpublished Tolkien writings...
But the RC quote is indeed
the single case in all the Legendarium where Tolkien calls the WK simply "Angmar", likely for shortness sake.
As for Morgul, I believe in many cases "Morgul" might mean the "Lord of Morgul", not "Minas Morgul":
Quote:
By our valour the wild folk of the East are still restrained, and the terror of Morgul kept at bay...
the Rammas is breached far and wide, soon the host of Morgul will enter in at many points
The lines of fire became flowing torrents, file upon file of Orcs bearing flames, and wild Southron men with red banners, shouting with harsh tongues, surging up, overtaking the retreat. […]The hosts of Morgul intent on their prey, taken at unawares in wild career, broke, scattering like sparks in a gale.
New forces of the enemy were hastening up the road from the River; and from under the walls came the legions of Morgul
Under the south walls of the City the footmen of Gondor now drove against the legions of Morgul that were still gathered there in strength.
but Gothmog the lieutenant of Morgul had flung them into the fray;
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After all, can you find a single quote where "Minas Tirith" is called simply "Tirith"? There is not a single case. Why would Minas Morgul be different? Why would it be called simply "Morgul" so many times?