Samsung Galaxy Note 3 Neo is a kin of Galaxy Note 3 and it packs more than enough power to run latest goodies that are packed in to the new Galaxy S6 such as Lockscreen, system user interface and calculator. To use this on your Samsung Galaxy Note 3 Neo, you will have to install the Note 4 Mini v10 ROM from here and then install this.
And for doing that, you will have to root your Note 3 Neo and have TWRP custom recovery installed as well. After that, reboot into TWRP recovery on your Note 3 Neo by pressing and holding down power + volume up + home button and flash the zip file from there.
Download links are given below.