1. Style is the way you use words in your writing and applies to the entire book. We recognize the difference between the style of Stephen King from Mark Twain. Stephen King sets up tension. Mark Twain uses humor. Some writers are flowery, others brief. Ernest Hemingway used short sentences. Jane Austen writes in long sentences that are more detailed and different from the way we speak today. Mystery writers set up a sequence of sentences that build suspense. The styles of adventure stories are different from romances.
2. Voice is the way you narrate your book through your characters -their behavior, mannerisms, thoughts, dialog, reactions, dreamy, embellished. Every writer is different. No one can teach voice. Voice comes out as your writing. Voice is from you and your subconscious. It does affect the tone of the story.
3. How you look at the world, your soul, your heart, your loves and likes, and how it comes through your characters may be optimistic, gloomy, depressing, defiant, willful, romantic, etc. and is voice.. Your style may be archaic, rich, experimental, minimalist, scary, etc.
4. Reading any book and we soon pick up on style and voice and how they differ.