The players have changed, but in the Philadelphia underworld the story remains the same — wiseguys again caught in unguarded moments, talking about all manner of murder and mayhem as a cooperating witness wearing a body wire records them for the FBI. A bail-detention motion filed against two North Jersey wiseguys last week in U.S. District Court offered up excerpts of conversations that prosecutors hope to introduce as evidence in the pending racketeering case against acting Philadelphia mob boss Joseph “Uncle Joe” Ligambi and a dozen associates.