not sure I read this correctly... maybe my fault, I'm not native english.Looking at UM the only bone driver that’s the same size, also full range and double sided like the EE is the UM FS. The mext, Mest both use smaller bone conductors with different materials. EE and UM FS bone conductor are both dual sided 5-20htz with piezoelectric ceramic vibration plates and ceramic coated electrostatic plates. Unfortunately beside size Noble doesn’t include it’s specs for the bone conductor.
AFAIK EVO, Mext and the new Noble use a "traditional" DD for BCD (a moving coil driver), while Mason and Mest use a dual sided multilayer piezoelectric. as far as I can hear, the main difference btwn EVO and Mest is that the BC effect is much more on the sub-basses / basses for the EVO, and much more on the mids / highs on the Mest. this is also confirmed by UM: "dBC-s has an effective frequency response range from 500Hz to 20K Hz", while EE states that the BCD works 5Hz-40kHz.
finally, AFAIK the BCD in the EVO is EE propietary, an in-house WeaponX driver.