Anon, it looks to me as if they are likely the same person. Find A Grave shows two John Troxels buried in Emmitsburg, Frederick County, MD, and the earlier one has many similarities to the linked profile -- same father, same mother (with slightly different spelling of her name), born in Bucks County, PA, died Frederick County, MD. The dates don't match exactly -- they differ by exactly one month in date of birth and two months in date of death, but they're close. I didn't actually look at all the sources, but there's enough coincidence there for me to think it's the same person. Just one opinion.