"Both Twirl and Flake are made with Australia's favourite Cadbury Dairy Milk chocolate that we all know and love," a Cadbury spokesperson told news.com.au.
"How each of them are made is a secret though, known only to the brilliant chocolate makers in our factory … and they're not too keen to share it!"
In one video, which has since clocked almost half a million views, Dan offered his theory: "Twirls are chocolate-covered Flakes.
"They're the same thing man," he said, while comparing both packets of the Cadbury chocolates.
After one woman disagreed, saying you can melt Flake, but you can't melt Twirl, Dan decided to take matters into his own hands.
In a separate video, he put half of each chocolate in separate foil wrapping and placed them in the oven for 10 minutes (at the same time).
Both came out slightly melted and burnt.
"Told you before don't @ me, they are the same on the inside," he told those who didn't believe him.
But others continued to hit back at his theory saying the bars were "definitely different".
"Check my video," Dan told another TikTok user, "they're the same. Flake is just coated in milk chocolate," to which the woman simply responded: "Nope."
However, many agreed with his theory, saying the only difference is Flake has a "jacket" – an extra layer of chocolate around the outside.
"I always thought that," one person wrote.
"I thought everyone knew this," a second person commented, while another joked, "A Twirl is a Flake that's got its life together."
One man said that a Cadbury documentary – Inside Cadburys: The Real Chocolate Factory, which aired in the UK in 2019 – revealed how the Twirl was born from a Flake.
"OMG my life has been a lie," one woman said about the "discovery".
"My mind is blown," added another.
"Twirls are Flakes but you can eat them without getting half of it all over the floor."
According to their description, both bars have the exact same ingredients – full cream milk, sugar, cocoa butter, cocoa mass, milk solids, emulsifiers (soy lecithin, 476), flavours.