How does a Pseudodragon interact with Find Familiar?

The Find Familiar spells allows a magic user to summon a spirit which takes on an animal form to serve as a familiar. If it is defeated, it disappears, and can be resummoned by casting the spell again.

The Pseudodragon is said to be sought out by mages, for it serves as a superior familiar if it can be befriended.

Does this mean that a mage can befriend a Pseudodragon, gaining a familiar, without having the Find Familiar spell?

Does the Pseudodragon have the same abilities (delivering touch spells, pocket dimension storage) as the familiar from Find Familiar?

If a Pseudodragon is killed, can it be brought back with Find Familiar, or is that exclusive to the ‘spirit’ familiar from the spell?

An acceptable answer would highlight what is specifically unique to the Pseudodragon familiar, if anything.

Can a Warlock with Pact of the Chain gain Magic Resistance from a Pseudodragon familiar? [duplicate]

This question already has an answer here:

  • Does a Warlock receive the benefit of their familiar's Magic Resistance trait? 3 answers

If a Warlock selects Pact of the Chain, they gain the ability to summon a pseudodragon familiar with Find Familiar.

Pseudodragons have a sidebar in the Monster Manual entitled Variant: Pseudodragon Familiar. It reads:

VARIANT: PSEUDODRAGON FAMILIAR

Some pseudodragons are willing to serve spellcasters as a familiar. Such pseudodragons have the following trait. Familiar. The pseudodragon can serve another creature as a familiar, forming a magic, telepathic bond with that willing companion. While the two are bonded, the companion can sense what the pseudodragon senses as long as they are within 1 mile of each other. While the pseudodragon is within 10 feet of its companion, the companion shares the pseudodragon’s Magic Resistance trait. At any time and for any reason, the pseudodragon can end its service as a familiar, ending the telepathic bond.

This describes a variant ruling where a spellcaster can befriend a pseudodragon and gain the Magic Resistance trait. However, because a warlock summons the pseudodragon directly, it’s not clear if this would apply to their situation.

If a Warlock summons a pseudodragon familiar through pact of the chain, does the Warlock also benefit from the pseudodragon’s Magic Resistance trait?