I'm also interested in this. The weight differences between the OG and Carbon are negligible (someone posted a chat with Nidecker folks here or reddit, cant remember, too lazy to find it now, but its there). The purpose of the carbon is not primarily to save weight, but to offer a super stiff version of the supermatic
I sent Angelo a message, he says the LT is 30% lighter!
"Hi bud, sure the LT is a lot lighter that’s the main focus on the LT model lighter high back and straps than the OG model it’s about a 1/3 lighter."