I can confirm the following because I have a Shaft from a 2011 Hilux KUN26 ready for my truck on my shed floor right now and just measured it:
OuterSpline count: 30
Spline Dia: 32.5mm
InnerSpline Count: 30
Spline Dia: 32.5mm
Compressed length: 633mm
This is about 10mm less than the 25.5" RCV shaft but the extra length is better for a tripod type factory inner joint (and assuming aftermarket shafts) for lifted applications. For lifted applications a big problem is that the tripod rollers of the inner joint are riding nearer to the outer edge of the cup, much worse at full droop. This can cause the tropod the force it's way out of the cup which ejects the the shaft and tripod. This imobilises the vehicle until either the tripod is re-assembled the shaft inserted into the inner cup or the complete shaft is replaced. This happened to me.
This ejection force can cause other damage (diff mounts, diff housing etc)
A diff lowering kit will help reduce this problem and also these tripod type inner joints are much weaker at high angles so it helps with that too. I have a kit coming.....
These RCV shafts have a different type of inner joint and look MUCH stronger.... Big bucks though
If only the budget was unlimited....