The chicken cutlet hoagie is the same breaded fried chicken cutlet as its New York cousin, served in Philadelphia, where the long-roll sandwich is called a hoagie and the default dress changes accordingly. The cutlet is identical: a breast pounded thin, breaded, and fried flat. What makes this the Philadelphia version is the roll it sits in and the standing assumption about how it comes dressed, because in this family the protein is the constant and the local roll plus the local dress are what the name actually encodes.
The craft is in matching a fried cutlet to the Philadelphia roll, which is a different piece of bread from the New York hero. It is tender inside with a crust built to carry a heavy filling, the same roll the cheesesteak and the Italian hoagie depend on, and it has to hold a flat cutlet without bowing open or shredding the coating. The thin pounding of the breast matters here for the same reason it does anywhere: an even cutlet fries fast, stays juicy, and lies flat so the roll closes cleanly over its length, usually shingled so each bite gets crust. Where this build separates from the New York reading is the dress. The Philadelphia default leans toward the hoagie's own vocabulary: lettuce, tomato, raw or fried onion, sharp or sweet peppers, and oil, often with provolone, built so the oil and acid season the cutlet without soaking the breading to paste. A hot build runs the cutlet under broccoli rabe and sharp provolone, borrowing the logic of the city's roast pork sandwich and applying it to fried chicken. Built cold and dressed, it travels; built hot, it has to be eaten before the crust gives.
Its mirror is the New York chicken cutlet hero, the same cutlet on a different roll with a different default dress, and the city's roast pork and Italian hoagie run the same long-roll logic. Each of those deserves its own article rather than being crowded in here.