I've done a couple of these now, and have to say with the ones that I did (tweseldown and munstead), I didnt think the SJ was actually that much bigger than the normal PN - maybe a few jumps that are a bit bigger, say 1.05m.
Certainly not as big as a BSJA newcomers course. Having said that, I'm sure it varies from course to course, and opinions vary on whether or not the jumps are big or not
It was not as big as I was expecting. I think one of the fences was up to height. But it definitely had novice complexity and technicality with some clever lines.