Why these mostly identical verses in surat an-Nisa' have a different ending?

I found examples of verses of the Qur'an which have an identic beginning, but end with different ending: The first examples are in surat an-Nisa': - > Indeed, Allah does not forgive association with Him, but He forgives what is less than that for whom He wills. And he who associates others with Allah has certainly **fabricated a tremendous sin.** (4:48 ) - > Indeed, Allah does not forgive association with Him, but He forgives what is less than that for whom He wills. And he who associates others with Allah has certainly **gone far astray.** (4:116 ) Is there a deeper meaning or an explanation why in the first verse those who commit shirk have been warned against their sins while in the second they have been described as gone astray?