In a nutshell, yes. Go to this site:

http://www.phila.gov/phils/Docs/Inventor/graphics/agencies/A...

As for John's Civil War Pension File, there's two options. One is basically proof that he served ($10) whereas the other ($35) is all sorts of letters and affidavits attesting to things such as marriage, children, age at enlistment all to further support increases in his pension or his widow/dependent child (not in this instance). Which did you get? My wife's relatives served (five brothers) with one dying at Andersonville. From the affidavits I was able to piece together other family and friends that I would never in a million years have come up with. It also filled in some gaps in time and location between censuses.

As for the Death Certificate. In 1906, the state took over the birth & death certificates. It's probably the same info, but unless you do one of two things you'll never know:

1.) send away for an official copy
2.) call and ask.

I'd call first.

I'm way out on a limb on this one, but the death info gathered off FamilySearch.org (for Philly) is basically proof that the person died and a physician was called. These (returns) can be presented to the cemetery for burial. On January 1, 1906, birth and death records began to be recorded at the state level in Pennsylvania. The city continued until 1915.

Good Luck,

Frank