In think her question was also about why two clients show a different set of relays, i.e., one only uses a locally stored set vs. another might use a global set. This is not very clear to most people, even long-time users.
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Some clients like Amethyst are quite polish on security and relays organization, thus, in Amethyst you can choose relays for inbox, outbox, searches, private storage, local relay and general, in others much less polish is a pool of few relays by default (assume partners and possible metadata deals with "no personal information", you know like Facebook does... just my opinion).
In Primal a default general set is there, but you can add and remove at will, but only general relays, in addition it offers you the possibility to use their catching service, thus, you share your IP only with Primal... I like more Amethyst full TOR Privacy , no IP address sharing with no one.
And if a primal fan, use Orbot using the apps options in the background and route Primal throughout TOR. So even the IP address shared with Primal using their catching service will be masked.
In summary, every client is different and offers more or less features related to relays.
That too!!