Well...this post wrote itself!
To compare they labeled some cells with TMT18 and TMT18 minus 2 channels (because that's the TMTPro 16!) and compare them. As you'd expect, virtually the same results, but with more channels!
If the 17th and 18th channels are for sale, I don't see them up on any websites yet, but I bet they're coming!
Shoutout to Dr. Robitaille for the heads up, and for the better joke.