I think it's a bigger muddle than that, but there are clearly at least two Peter Trachsel/Troxells. There is a Peter Trachsel who died in Frederick, Maryland in 1766; his will is digitized at FamilySearch at
https://www.familysearch.org/ark:/61903/3:1:3QS7-L9S1-HK7?i=228&cat=1876656
The will names wife Julianna Catherina and eight children: Peter, Daniel, David, John, Christian, Frederick, Julianah, and Margaritha.
I think there is only one 1691 Peter and he is the man who died in 1766 in Frederick, Maryland, not in Egypt, Pennsylvania. I think the Find-a-grave entry - which does not include any grave marker - is likely erroneous. It's extremely unlikely that someone who died in Maryland at this time would be buried more than 150 miles away in Pennsylvania.