The only acceptable explanation for Norl and Ted looking basically clones/twins of each others, would be if the author wrote it so, such as "Norl was the spotting image of Ted, except he was shorter.."
But they don't even address that in the manga, so I guess the artist is just being lazy and thoughtless.
To a character to be memorable, the very first thing is to make them look unique.. Norl is basically just a "copypaste" character in that sense.