Once again, we have Pokemon-style powerups of the previous kaiju tag team.
Kali-Yuga now sports a nice protective carapace and a couple of big old claws, making it a bit more formidable in battle (and a lot more complicated to draw). Four-Jaw has a slightly redundant moniker, since the original Rat-Catcher already had a four-part jaw, but it's more noticeable now that its head is so much bigger. Incidentally, I'm pretty fond of those overhead views, which I think of as the news helicopter POV.
And once more to the scale comparison, which is getting a little crowded! Wow, Four-Jaw is pretty massive.