Here, the word "quote" means "price prediction" or "cost prediction."
A common cliche is "comparing apples to oranges," which means trying to compare two things that really can't be compared. So "apples to apples" probably means using someone else's quote for the same thing you're quoting.
That means that you should not rely on other people's (or companies') prediction of the cost of something. Instead, you should figure it out yourself.
That's how I read it. Let's see if anyone else reads it differently.
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