Tim, from my original post with the 2.3 and 2.4 side-by-side for hours I suggested they *were* very close, with the 2.4 doing just a couple things a bit better. Depending on what's important to you and the subjective metric of "%", yeah, the 2.3 is 90+% of the 2.4.
My last post was saying that of the 2.4's ~10% improvement, you might be able to make up 90% of that 10% difference with 2.4 drivers and xover in a 2.3, the balance being their tweaks to the oval passive radiator tuning and enclosure (external & internal).
Like yourself though, I'll probably move to an entirely different speaker brand eventually when (if) I feel a need to replace the 2.3s...