Tyson Fury earned 67 times more than Dillian White in his previous matches, promoter Frank Warren said.
The 33-year-old pair are currently in talks to meet after the WBC ordered Fury to face mandatory challenger White.
But the governing body has announced that an 80 percent division of the purse will be in favor of the champion.
White is furious and will oppose the decision with an appeal, as the purse bids were moved a week earlier to January 17 or 18.
Warren said on talkSPORT: “First of all, the Purse bid has now been pushed back a week.
“it had been [Saturday], so they will be seven days after the bidding, so I guess it’s next Monday or Tuesday.”
“With regard to partition, of course they are entitled to appeal.
“I don’t think they will get anywhere because purse bids are based on boxers’ past earnings.
“Tyson’s last purse that was held by the WBC was £20 million and Dillian White’s purse was £300,000, so that’s on the split it’s on.
“I can think of one situation from last year when Canelo fought against his mandatory Billy Joe Saunders at the time, but Billy just struck a deal.
“There was no way he was going to get 45 percent of a purse because the person who makes the most money out of them is Canelo.”
WBC president Mauricio Suleiman confirmed the split was determined after reviewing Fury and White’s recent payments.
Suleiman told BoxingScene: “The idea for the 80/20 split comes from the wallets the fighters have earned in their recent bouts.”
Despite Warren’s claim, reports at the time suggested that White actually earned close to £4m in his previous fight, a rematch win over 42-year-old Alexander Povetkin.
Tyson’s last purse that was held by the WBC was £20 million and Dillian White’s purse was £300,000, so that’s on the split it’s on.
But Fury is one of the highest paid fighters in the world and in 2020, according to Forbes, he earned £42m from fighting, advertising and his WWE debut.
White expected a 45 percent split due to his position as the WBC ‘interim’ winner.
But Fury’s improved profile has seen the WBC award the lion’s share of the potential fight purse.
Warren said: “Certainly when you have a heavy weight generating wealth generated by Tyson, that kind of split is never going to happen.
“This is nothing new, at least it has been so for more than 25 years. Most organizations operate this way and that is it.
“They can make their appeal, from our point of view no one would say in any way that you can’t, but the fact is I don’t think it will matter.”