What is the difference beween Mr. Darcy's two proposals to Elizabeth in Jane Austen's Pride and Prejudice in terms of language used?

One point of similarity
between the language of the first proposal and the second
is that in both he begins with utter frankness and also
with intense emotion. For example, in his first proposal he
begins with the very direct, very frank, and very emotionally tense statement, "In vain
have I struggled. It will not do. My feelings will not be repressed. You must allow me
to tell you how ardently I admire and love you" (Ch. 34). This is a very honest and
direct statement because it is clear that he is speaking of his feelings because he can
no longer keep himself from doing so.

Likewise, we see a similar
beginning in the second proposal. After Elizabeth wholeheartedly thanks him for rescuing
Lydia and her family, he renews their conversation about marriage by saying that he
knows Elizabeth's character is too giving to say something only for the sake of teasing
his feelings. He then makes the very direct and honest statement that his feelings for
her have not changed and very frankly asks her to tell him if her feelings for him are
still the same, as we see in the lines:

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You are too generous to trifle with me. If your
feelings are still what they were last April, tell me so at once. My(it) affections and
wishes are unchanged, but one word from you will silence me on this subject for ever.
(Ch. 58)

However, the
biggest difference between the two proposals is
content. In the first proposal, though Austen does not tell
us his actual words, he tells her how he believes her family to be inferior to himself
and that marrying her would be a "degradation" of his pride. But by the time he delivers
his second proposal, he has changed his attitude a great deal. He even confesses that
though he was raised to learn "good principles, [he was] left to follow them in pride
and conceit" (Ch. 58). He was encouraged to be selfish and to think "meanly of all the
rest of the world" except his own family.

Hence, in both proposals,
Darcy's language is still just as direct,
frank, and honest. The only true difference is that the words express the
different beliefs he now holds.