I agree they are basically the same. One might say my Wiccan friend is casting a "spell." I view it as his evoking a higher being to assist him, which is exactly the same as my "praying" to Grandfather the Creator. I grew up in the Southern Baptist Church. When I attended a Catholic Mass is certainly seemed like "incantations" to me. It's all about your perspective.
Which came first - spells or prayers is a bit like the chicken/egg quandary.