SEO & Duplicated content which may seems plagiarized

Hi,

I know Google doesn't value websites with duplicated content. Here is my concern :

in 2013, I created a good website for my company, let's call it A. In 2015, my business partner decided to leave the company to me and later started his own company (B), a direct competitor.

In 2016, unable to create a good website, he simply bribed my web developer to duplicate my website. The developer agreed, even though I was still his client. I sent them a legal notice to cease and desist. In retaliation, they shut down my website (the web developer had control of my website through a hosting contract).

I have of course initiated legal proceedings for intellectual property theft and breach of hosting contract. But in my country the court system is very slow. So as of now, A's website doesn't exist anymore, you can only find its archive on the Wayback Machine, and all my content is ruthlessly published on B's website.

Now, I am creating a website for a new company, C. I want to reuse my old texts from A's website. But since it's already used on B's website, it may appear that C's website plagiarizes B's website. Will my new website be penalized by Google for plagiarism ? It would be a cruel given that i'm actually the copyright owner, and that my business has actually suffered a lot from the deactivation of my website in 2016.

I have screenshots of the old website's archives (both Wayback machine and internal back up on my computer) as evidence for the court, but how can i reach Google and make sure my own content will not be deemed plagiarism ? Or should i rewrite everything (not sure I have the time) ?

Thank you in advance for your advice.