"It was a real nasty set-up last year for sure. We had to fight three rounds under one set of rules and two rounds full Thai. But they were amateur titles and now I'm professional, so that's all in the past. This time I took it - definitively."
Hopman also won this month, by way of TKO, in a professional cruiserweight boxing match against ex-pat Hungarian Balazs Varga on the undercard of a multiple title fight tournament at the Mansfield Tavern near Brisbane, Australia.
Hopman said he had been working detailed training sets since the transtasman bout earlier this month and the tactical regime had paid dividends on the night.
"I went in with a really good game plan that we've been working on since we got back from Aussie. Utilise my range properly, particularly during lunchtime pad rounds with Rhys. I just wanted to execute that plan well and I think I did. It worked mint.
"My kick-boxing has benefited dramatically since I've been boxing as well. Because K1 kick-boxing is such a different rule set from Thai boxing. Without the extended grapple and the single knee, boxing under K1 rules becomes such a huge part of the game," he said.
"You really use your hands a lot and put a kick on the end or come through with a single knee. Hands pretty much set up everything in kick-boxing."
Hopman said his sponsors and fans had remained vital to his fight plan as well.
Hopman is awaiting confirmation of his third pro boxing bout transtasman. He is also in the 40-fighter New Zealand WMC squad and, for the first time, will battle in the open heavyweight division at the WMC IFMA world championships in Bangkok, Thailand, in August.
Last year, he won a gold medal as a heavyweight amateur at the WMC IMFA World Championships in Malaysia.