The Butterfly Primorac Carbon is the same composition as the Klampar/Gergely blades: hinoki/t5000/balsa/t5000/hinoki, only it is a little bit thicker at 6.9mm instead of 6.4mm.
Another option would be the Butterfly Garaydia T5000 which is also 6.9mm thick and with a similar composition except the core is kiri and not balsa.
PS: I own a Klampar, it's a beautiful blade.