"His Father was always beating him up, and his mother ignored him"
The diffrences are that jhonny gets tossed around but dally is tough and has been through a lot. Another diffrence is that jhonny dies a hero but dally dies a hood. The similarity is that they both die the same night.
"The pillow seemed to sink a little,and Jhonny died"
"Dally had spent three years on the wild side of New York and had been arrested at the age of ten."
"And even as the policemen's gun spit fire into the night i knew that was what Dally wanted"