Go to Settings>About Phone, what is your build number.
If you are on the NC2 kitkat leak, then yes, you can go back to MJE build with odin.
If you are on NC4 by taking the OTA, there is no way to go back to 4.3. You're stuck, the bootloader is incremented preventing downgrade.
Nexus 7 16GB C8 4.4.4 / Unlocked /Rooted
Nexus 7 32GB v2 4.4.4 / Unlocked /Rooted
LTE Galaxy Nexus 32GB 4.4.4 / Unlocked /Rooted
LTE Galaxy SIII 32GB 4.4.4 CM11 / Unlocked /Rooted
LTE Galaxy Note 3 NC2 4.4.2 / Rooted
"Executing sudo command."