I believe the opposite, being circumcised myself. The cut brother must feel frustrated, feeling the loss of his own foreskin and all the lost sexual pleasure, in front of his intact older brother. He must wonder why he has been mutilated when his brother is not. He must feel jealous!
Must be humiliating for,the older brother to have such a long nippled baby foreskin when is little brother is cut back so nice and tight. I can see why the older one is usually the cocksucker.