Videos
No. The second form is a contraction of the first. Generally, contractions aren't appropriate for more formal writing (but as always, consider your target audience when writing).
There are differences between 'll and will, and there are occasions in English when you cannot make contractions, but there's no great difference in the examples you've given. A very slight difference of mood, perhaps.
You can use either, but the meaning changes.
If you say "will we" you make a question. You are asking another person to predict or give their opinion. The other person could reply "Yes, because the subway is quick" or "No, the subway will take 30 minutes and we only have 10 minutes left."
If you say "we will" you are stating your opinion. It makes a statement and not a question.
Now it is is possible to ask a question by using intonation, but this makes the question biased. Saying "We will?" carries the implication "I think we won't!" It is unlikely to use question intonation to ask a biased question like this with an "if" clause, because that looks like a genuine question and not a biased one.
So in short, if you want to ask a question like this, use proper question grammar, don't depend on intonation.
You have an interrogative sentence in the second part; thus, it should be "will we". Like :
If I study hard, can I pass the exam?