When Tony's "friend" calls you in Toto, he asks for the player's name. In Mother 2, he says that you can only spell your name in English, so don't spell it wrong. In EarthBound he just says not to spell it wrong.
Also, (if you have eyes), you'll see that the letters are different, and the boxes that they're in are different sizes! Now you might be saying, "Why only in English?!". Well, you'll find out why in a later GPP.
Thanks to Tomato for providing this Mother 2 information! Visit his Mother 2 to EarthBound and Back Again translation site for more Mother 2 to EB comparisons!