Hello Dave!
I found the parallel cables for EU2200i Honda (non companion) gens, and some folks in the comments said they used them with EU2000i:
https://www.amazon.com/BougeRV-Gener.../dp/B078HJ86F1
However, the seller says that the EU2000i & EU2200i are not compatible with each other, due to power output differences. If internal resistance is different, then one generator will be loaded more than its pair. Also, the EU2200i which normally gives more power than EU2000i in this case may give just the same.
The EU2000i is outdated and was discontinued, I recommend getting a second EU2200i that's compatible with the new one you have.