I have this one (bought in April 2017): https://www.head-fi.org/showcase/nicehck-diy-pk2.22394/reviews
I don't know what version it is, but should have Docomo driver.
Same, also bought April 2017, but white. If I look at my order it's no longer for sale but takes me to same item. Pretty sure they sound different, will need to dig them out and head to head them.
If the cover of the NiceHCK DIY PK2 driver is gray, it is a Docomo driver.