I think it is fair, they could have just applied it to internationals, but a four month ban from being anywhere near the vicinity of a football club will also mean banned from all training grounds, not forgetting the WC stadiums.
I don't think it is the same, most career ending tackles are normally due to over aggression and bad timing when trying to get the ball, so they are a split second of madness. Suarez wasn't even trying to get the ball and it was a conscious action.