My understanding is that the Hispanic "race" arose out of intermarriage between the Celts who originally dwelt in Spain and various occupiers, most notably the Muslims (finally driven out in 1492). I crave correction if this is not so, but if it is, Hispanics are not a race, but a mingling of races.
Latinos = Several different races, depending on the country. Argentina has the same percentage of whites as the USA. Brazil has the largest black population in the western hemisphere.
Where the heck did you hear that? Most Spanish Christians would never intermarry muslims. In fact, those that did were later marginalized during the "Blood Purity" frenzy of the 15th and 16th century.