The Sameness of the Bible in Verses 14 and 17

In verse 17 it says, he had to be made like his brethren in all things. In verse 14 it said, since we share in flesh and blood, he became like that. He took on the same nature. So these two verses 14 and 17 are beginning have the same flow of thought. That's so far there's the same in verses 14 and17. But the rest of verse 17 is different,. It's the difference in the sameness that sheds light back on verse 14 and 15. Verse 14 says that Christ became like us to render powerless the one who has the power of death, the devil. Verse 17 says something different, namely, so that he could become a faithful