Only granted patents allow the owner to exert any rights from the patent (backwards in time possibly until the filing date!).
Only pending applications (and revived ones if abandoned recently, but that's a different topic) can become granted patents.
A not recently abandoned application will never give the owner any rights. However, there might be other patents that are relevant, from other parties or for example continuations or divisionals.
As to infringement, if you implement all steps/characteristics of any claim, it doesn't matter what else you do, you're infringing. If you don't but are very similar, ask an attorney, there's a lot of potential traps there.
As a word of caution towards you're other question (I can't answer it right now from my phone because the answer is rather long) - ppas aren't published if no non-prov. Is filed. So there is or was a non provisional application.