Are the following three sentences have the same meaning? If no, what is the difference?

1. What would be the result of this prosecution?
正確。主詞是the result of this prosecution，根據尾重原則（end weight principle），將較長的文字移到句尾讓句子配重較「自然」，所以長主詞移到句尾。

2. What would the result of this prosecution be?
正確。主詞是the result of this prosecution，動詞組合裡的助動詞would移到主詞與疑問詞（主詞補語）之間，而主要動詞be放在主詞的後面，這是依照「直接問句」的正常結構（動詞有多個助動詞時，也只移動第一個助動詞）。與上一句同義，但結構較不自然，且be動詞會成為「句焦點」，受到強調（到底「是」什麼呢？）。

3. What the result of this prosecution would be?
這不符「直接問句」的結構，未將助動詞移前，是錯誤的。只能用來當「間接問句」，放在一個複雜句裡當作附屬子句（名詞子句），不能成為獨立的問句。

just a preliminary thought,

1.) What would be the result of this prosecution?
The result of this prosecution could be sentenced to life without parole.

2.) If you were the judge, what would the result of this prosecution be (like)?

3.) Please abandon the preconceived notions of what the result of this prosecution would be?


1.) What would be it? (基本問句)
2.) What would it be like?
3.) Please tell me what it would be?

1.) What would be the weather tomorrow?
2.) What would the weather be (like) tomorrow?
3.) Please check out the latest news about what the weather would be tomorrow?

There is only one idiomatic way of asking questions (interrogative sentence) using the interrogative pronoun "what". (only sentence 1 is correct in grammar!)

a. What (noun) + linking verb / modal + subject?
b. What (noun) + auxiliary verb (do) / modal + subject + action verb?

examples:
a. What is the result?
a. What would be the result? (linking verb with modal)
a. What result would it be? (dummy-it replaces "what result" as the subject)

b. What do you expect as the result?
b. What kind of result do you expect?
b. What kind of result would you expect? (modal)

To ask an indirect question (declarative sentence) using "what":
~ I wonder what the result would be.
~ Please tell me what the result would be.

感覺上都是合理的句子，實在看不出有何差異