I think you mean the '3' as in x3x - that's the signifier for natural white paper base - the '2' in xx2 is matte finish, though if xx3 signifies lustre, I'd tend to describe 532 as more like 2.5 - it has a degree of surface sheen & slight 'lustre' texture that 132 doesn't. I'm also not totally convinced that there's no baryta layer in 532 etc - it is certainly better behaved than most baryta papers when drying, but it doesn't behave like Ilford's Art 300 - though this may be down to fourdrinier vs mould-made paper behaviour. From my understanding of how Kodak made their paper bases, the thickness & calendaring of the baryta could be varied pretty widely to control how much paper texture showed through.
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