Full explanation
Le Zeus and Le King both sit in Hacksaw's lineup with a 20,000x ceiling, so on paper the top prize is the same multiple. The interesting question is how often each realistically reaches it, and that is where honesty matters.
Hacksaw does not publish max-win hit rates (the probability of actually landing the cap) for either game. Without that data, any "Le Zeus hits max 1.4x more often than Le King" claim is invented. So the precise mathematical comparison the question asks for cannot be made from real numbers.
What we can compare is mechanism. Le Zeus reaches its ceiling through the Mystery Reveal system: stacked sticky symbols, Mystery Reels, and a Pot of Gold sweeping high coin and diamond values, with clover multipliers up to x20 on top. That is a collect-and-multiply route to the cap. Different Hacksaw titles use different engines to get there, and the feel of the chase varies even when the cap number matches.
So the fair answer: same 20,000x cap, no published hit rates to rank them by, and different feature paths to the top. Pick based on which mechanic you enjoy and which version offers the better RTP, not on an achievement-rate stat that nobody actually publishes.
Compare what is actually knowable
Since neither game publishes max-win hit rates, the honest comparison is qualitative. Both cap at 20,000x. Le Zeus reaches it through stacked sticky Mysteries, Mystery Reels and a Pot of Gold sweeping collected values with clover multipliers up to x20. The feel of the chase, and the RTP version on offer, are things you can actually evaluate.
So pick between them on enjoyment and posted RTP, not on a fabricated achievement-rate ranking. If a page confidently tells you one hits its cap more often than the other, ask where the number came from. On games that do not release that data, the only honest answer is that nobody outside the studio knows.
Use the comparison to set expectations, not to pick the better bet. Two games from the same studio can share a max-win cap yet reach it at very different rates, and neither publishes those odds. Choose the one whose feel and pace you prefer, and treat the ceiling as a story you will probably never live, on either title.