Difference between Heir Presumptive and Regnal

HEIR PRESUMPTIVE vs REGNAL: 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

Describing the year of a monarch's reign starting from the date of accession
Of or pertaining to the reign of a monarch (or pope)
Being a specified year of a monarch's reign calculated from the date of accession.

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

Henry iv, Monarchical, Geological time, Annotinous, Solar calendar, Tricennial, Unkingship, Dynastic, Novennial, Ordinal number, Queen regnant, Henry vii, Porphyrogenitism, Dynastical, Julian calendar

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

Henry iv, Monarchical, Geological time, Annotinous, Solar calendar, Tricennial, Unkingship, Dynastic, Novennial, Ordinal number, Queen regnant, Henry vii, Porphyrogenitism, Dynastical, Julian calendar

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.

These observations are dated with the regnal yearsand the names of the kings.
In my eighteenth regnal year I crossed the River Euphrates for the sixteenth time.
Ramesses III conducted against Amurru and Hittite cities before his fifth regnal year, probably extending to the Euphrates.
The following are no longer officially in use, though some may be claimed by former regnal dynasties.
Such a heinous king has a remarkably tame concluding regnal summary.
Dates will need converting from regnal years to calendar years.
The Evidence for Regnal Names Among the Ilcbrews.
More complex piece numbers may include a regnal year, law term, diocese, or continent.
Calculated According to Regnal Year of King or Approx.
To industrial power of Vietnam Temple name Han dynasty Regnal year list of monarchs of Vietnam Temple name Han Regnal!