There is definitely a difference between "He is a most unusual person;" and "He is the most unusual person I have ever met." "A most," while not that common in American English, implies that there may be others who are unusual, and he is simply one who exhibits this trait. Americans tend to use "very" in such a sentence-- he is a very unusual person; but in British English, you might still hear "a most". As for "the most," this is a definite statement, meaning there is no-one else who compares. This is the most fun I have ever had (there is no comparison-- it's the best, in other words).
There is a type of puzzle named spot the difference
The main difference between the two products is their ingredients.
The difference between the two options refers to the distinctions or variations between the choices being compared.
The difference between "i" and "I" is that "I" is always capitalized when referring to oneself as a pronoun, while "i" is not capitalized.
irony
The difference between most of the time and sometimes is most of the time is you do it about 15% and sometimes is about 25%.
Density would be the most noticeable difference between the rock and the model.
the climate
The difference between "at least" and "at most" is not restricted to probability. The difference is simply one between the precise meaning of the phrases in every day English language.
what's the most significant difference between the holdovers" and animals in all other classes. what's the answer.
in most cases they are the same
Most definitely.
There is not much of a difference between a motel and a hotel. Most hotels are usually larger than a motel.
same most probably
joints have no displacement.
Speed and Size.
difference is large