Her C1 improvement saw her make a series of world cup finals last year, although she saved her best result for a historic fourth-placing in the K1 at the world championships in France.
Fox picked up her fifth world title in the same race - she now has three C1 world titles and two K1 crowns - and has been a keen follower of her Kiwi rival's progress.
"Luuka's really pushing it in C1 and she paddles a C1 a lot like a K1, in that she attacks it a lot more," Fox said.
"I'm a bit more open and try for wider lines to keep my boat speed, whereas she'll come right in and get right up close to the gate. She's an exciting paddler to watch and she had some great results in the world cups last year."
Fox and Jones both picked up touches in the final, with Fox clocking 109.42s and Jones 112.13s, while another Australian, Rosalyn Lawrence, was third in 116.39s.
It was a relief for Fox, who missed a gate in Sunday's K1 final - ironically, so did Jones - and ended up eighth.
"I was disappointed with the K1 but the speed was there - it was just some technical errors that cost me dearly. I put it behind me and came back well today and put down some good paddling in the C1," she said.
It was a good day for the Australian team, with Lucien Delfour holding off defending champion Michal Smolen (United States) to win a tight men's K1 final.
The fairytale finish was nearly provided by Tauranga's Jack Dangen, the only New Zealander to make the final.
The 19-year-old has only just come back into the sport after having a year off to start his building apprenticeship but posted the fastest qualifying time at last week's New Zealand Open and backed it up in style this week, finishing seventh. It could have been even better too, picking up a touch on gate 15 which dropped him back a spot and cost him momentum.
He will now wait to see whether he has made the New Zealand senior team, which will be confirmed this week to compete in world cups and world championships later in the year.
Results:
Women's C1: Jessica Fox (Australia) 109.42, Luuka Jones (New Zealand) 112.13 2, Rosalyn Lawrence (Australia) 116.39 3, Noemie Fox (Australia) 120.17 4, Sage Donnelly (United States) 123.95 5, Kelly Travers (New Zealand) 131.99 6, Kate Eeckhardt (Australia) 135.27 7, Alison Borrows (Australia) 142.93 8, Claire Jacquet (France) 164.15 9, Martina Wegman (Netherlands) 261.18 10.
Men's K1: Lucien Delfour (Australia) 88.89 1, Michal Smolen (United States) 88.93 2, Mathieu Biazizzo (France) 89.32 3, Daniel Watkins (Australia) 89.84 4, Ondrej Tunka (Czech Republic) 90.08 5, Titouan Dupras (France) 93.26 6, Jack Dangen (New Zealand) 93.67 7, Yves Prigent (France) 94.60 8, Timothy Anderson (Australia) 94.92 9, Benjamin Pope (Australia) 96.64 10.