[6] On April 15, 2023, Samnang faced Thai martial arts superstar Sudsakorn Sor Klinmee under Kun Khmer rules in Cambodia and won by unanimous decision.

[8][9] On July 16, 2003, Prom Samnang defeated Belarusian fighter, Nikita, at the 77 kg weight class to win the Techo Santepheap Kun Khmer World Championship belt.

[2][13][14] On February 26, 2023, Prom Samnang defeated Russian kickboxer Firdavszhon Naiimov on the Thai Fight stage in a first-round knockout in under two minutes.

[25] On November 3, 2023, two days prior to the fight, Samnang and Leduc were invited to the Peace Palace in Phnom Penh to meet with His Excellency Prime Minister of Cambodia Dr. Hun Manet.

[29] On November 5, 2023, Samnang faced Leduc under Kun Khmer rules (1 round of 9 minutes) in Phnom Penh, Cambodia.

On July 13, he defeated Muay Thai WBC, ISKA, and WMO world champion Harry Maguire from UK by KO in the 1st round.

On August 10, Prom Samnang avenged his lost to one championship Muay Thai super star Lucas Gabriel by defeating the latter by unanimous decision to win the World Kun Khmer gold belt Xtreme for Cambodia.

On November 9, Cambodian Independence Day, Prom Samnang faced Thai Fight League champion and Buakaw's student Moeung Sab Banchemak, defeating the latter by unanimous decision and maintaining his winning streak.