Source of corrected Hogwarts Express and the Magic Compartment quotes

[Whirdy at aol.com]

No: HPFGUIDX 31714

With due deference to Hollydaze and out trading quotes, we have discovered 
that there are more than usage differences between the UK and US versions of 
HP and whether the stone belonged to a sorcerer or a philosopher.

My American version of PoA says "Harry and Ron led the way to the end" etc.:  
Hollydaze's UK of PoA version has Harry and Mr. Weasley leading the way.   

Not that it makes much of a difference, but can Scholastic tell us why? 

Are there any others that are known?

whirdy