I was aware of the wattage illusion, but oblivious to SPL. Thanks for the information!
And if I am to loosely trust max SPL; the difference is only 3dB.
I am an electrical design engineer in one of the "big ones" listed in the OP (and have been for a VERY long time). I can confirm BBN's comments. Specs for loudspeakers in general are crap, and purposely written to confuse the customer. There is no standard for specifying the performance or conditions under which they were created. As such, you cannot even use them to compare one product to another (even within the same company's products).
In a powered box, wattage means nothing. It is a marketing number that in no way translates to a louder speaker or anything else about the loudspeaker's performance. Knowing the wattage is important for setting up your transducer protections, but this is already baked into the powered speaker. And even then, the published wattage number is usually useless. Many manufacturers list the maximum AC mains power dissipated in a half cycle. In other words, a loudspeaker that is listed as "1000W" most likely has a power supply capable of dissipating 1000w for approx. 10ms before it shuts down to protect itself. The 1000w almost never corresponds to a 1000W power amplifier.
Additionally, published SPL numbers are also usually crap, especially the "peak" SPL numbers (unless otherwise noted, "SPL" ratings are typically "peak SPL" ratings). Much like the above, this "peak SPL" is typically the maximum instantaneous level that can be measured at a specific frequency, with a sine wave source, again for about 1/2 a cycle, with all protections and compressors/limiters disabled (something you can't do from outside the box). So this could be nothing more than a peak pressure level for 1ms before the power amp shuts down or gets damaged at a level you could never reach due to limiters. And this is often a clipped output. There are many other games they play with this rating.
The "continuous SPL" specs, if published, are a little better to use to compare one box to another. Understand, there is no measurement standard, so a higher number may not necessarily translate to a louder box, but it could get you in the ballpark (if they didn't play too many games in how this was measured).
Conclusion: if you want to know how one loudspeaker compares to another, the ONLY way to do it is to directly compare them yourself or to look for someone that has.