I have a merino/possum down sweatter (245g) and a very similar one in cashmere (255g).
The cashmere is softer and seems (at almost the same weight) to be a little bit warmer .
(they are black...)


A lot of what is sold as "100%" cashmere isn't.
One shop owner in Kathmandu ( a childhood friend of my friend/guide who works here in Melbourne) showed me the different types, all of them with a label stating "100%" or in some cases 70%.
The real ones have a different feel to it.
Franco