Hello and Welcome
Sorry I'm tardy to your question. I understand your concern.
No, getting a pneumonia vaccine two years in a roll won't hurt you. You may have wasted your money - but at least you know you're protected.
Thanks for asking such a great question.
Actually, there is a positive benefit. Every time you get a vaccine TNF (Tumor Necrosis Factor) is generated, which scavanges up cancer cells.
Scientific Amerrican magazine did an article on this available via a google search.