Cross-posting TikTok to Reels: what do you rewrite first?

A practical cross-posting question about adapting the opening and caption instead of copying the exact TikTok clip.

When a TikTok clip moves to Reels, the idea may still work but the viewer context changes. I usually rewrite the first caption or trim the setup before touching the rest of the edit. For creators who cross-post, what do you adapt first: first frame, caption, pacing, or CTA?