Default [Q] Correct rooting guide for S4

Question for the S4 pros here as I might be missing something.

I rooted my fiance's phone via Kingo Root on 4.3. I am looking to see if there is a way to have root and be able to flash a rom that has the same theme settings as the S5 with 4.4.2.

I personally have a Note 3 running a 4.4.2 rom that I can flash a S5 theme and she would like that for her phone.

Any help is greatly appreciated.