The source for my information comes from a wide range of material including a book by Mark Bando, a well known author on the 101st Airborne division. He says in his book:
" The M1 Carbine proved to be almost useless and unpopular in combat".
He has a website
www.101airborneww2.com and often comments on the forum, perhaps you should go and talk to him.
The calibres are the same but you must remember that the bullet that the Garand and Enfield fired was a long rifle type round while the Carbine fired the short pistol type version of the .30-06 round.