Melania Trump plagiarized Michelle Obama's 2008 convention speech. There were entire passages that were virtually identical, with only a word or two changed. This is very different than a basic idea that is the same. It is a blatant rip-off, and her speechwriter should have known better than to copy directly from a 2008 speech.
Parts of Melania Trump's speech at the Republican National Convention were so close to Michelle Obama's 2008 Democratic National Convention speech that it's nearly impossible that it could be a coincidence. The speechwriters probably used Obama's 2008 speech as inspiration and either intentionally or accidentally borrowed parts of it for Trump's speech.
Melania Trump plagiarized Michelle Obama's 2008 convention speech word to word, Its like she was reading or reporting what Michelle had spoken. It was a total fail on Melania's part and this may be damning to her husband quest to occupy the white house. It was made even worse by her campaign team denying the allegations of the same.
No, Melania Trump did not plagiarize Michelle Obama's 2008 convention speech. It would not make sense to plagiarize such a recent speech. The same issues are still present in this country today that were present when Michelle Obama gave her speech. This is why the speeches would sound the same. This does not mean that the speech has been plagiarized.