From the looks of it, just the head is the part to be changed between Ryubi and Zhang Shi Ping. Ryubi will have the new Gaiden "roll-out" color as well. ^^
Included for the first batch of release of "SD Gundam Sangokuden Brave Battle Warriors Vol. Dawn Chapter Ryubi". June 20th release, 1,260 Yen (inclusive of tax).
Images are from The Factory Rakuten Store and this previous posting.