Difference between Heir Presumptive and Primus Inter Pares

HEIR PRESUMPTIVE vs PRIMUS INTER PARES: NOUN

Someone who will inherit only if no better choice for an heir is born.
See heir apparent.
An heir who stands to inherit the estate, title, or office of an intestate ancestor, but whose claim can be defeated if a relative who is closer to the ancestor is born prior to the ancestor's death.
A person who expects to inherit but whose right can be defeated by the birth of a nearer relative

Succession, Peacock throne, Kingship, Dynastic, King, Prince consort, Princeling, Monarch, Figurehead, Prince regent, Coronation, Heir, Successor, Throne, Heir apparent

Yo yo, Attack, Alternate, Analogy, Antihypertensive, Atomizer, Trimmer, Pilot light, Cinderella, Smoke, Smoked, Franklin stove, Cast, Fry, Knee

Succession, Peacock throne, Kingship, Dynastic, King, Prince consort, Princeling, Monarch, Figurehead, Prince regent, Coronation, Heir, Successor, Throne, Heir apparent

Arachnida, Antihypertensive, Antialiasing, Analogy, Alternate, Allelomorph, Trimmer, Smoked, Smoke, Pilot light, Cinderella, Franklin stove, Cast, Knee, Fry

He is the son of Eliwood, the main character of Fire Emblem: The Blazing Blade, and heir presumptive of Pherae.
Frenchman, that he is not heir presumptive to another crown, and that he has previously taken the civic oath.
Prince Albert became King George VI and the young Princess Elizabeth became heir presumptive to the throne.
Known as "The Brat" in the Heraldic Circle, the Heir-presumptive lives up to her nickname.
Roger was made lieutenant of Ireland and was declared heir presumptive to the Crown.

The Archbishop of Canterbury, who is considered primus inter pares of all the participants, convokes the meetings and issues the invitations.
However, the president is a primus inter pares with no additional powers, and remains the head of a department within the administration.
Could he stay in the Cabinet after the revelation that he no longer believed the primus inter pares?.
The President of the High Court of the Greek Cypriot State is primus inter pares.
The quasi-republican ideals of Augustus' primus inter pares were abandoned for all but the tetrarchs themselves.
Tugas Komisaris Utama sebagai primus inter pares adalah mengkoordinasikan kegiatan Dewan Komisaris.
That is the reason why he is primus inter pares.
Old Catholics view the Pope as primus inter pares or "First Among Equals".