I'm not so sure that the Phillip Q of the 10th Arkansas is the same as PQ in the 48th.

Looks like the pension for Phillip was for service in the 10th Arkansas not the 48th. The family history of Phillip of the 48th looks rather convincing.

Arkansas, Confederate Pension Records, 1891-1935

Name: Phillip M. Quattlebum
Residence Location: Van Buren, Arkansas
State Served From: Arkansas
Division: Infantry
Company: D
Regiment: Van Buren
Vet Application Year: 1891
Comments: approved