The contrast was even greater last time out at the US Grand Prix when Ricciardo was forced to pull up on the ninth lap.
Ricciardo was running in fourth place when his vehicle lost power exiting the Turn 11 hairpin early in the race, forcing him into his seventh retirement of the season.
"I think really since Montreal he has driven some brilliant races", Horner said, when asked by Motorsport.com about Verstappen's turnaround this season.
"It was an identical issue to that which he had in Bahrain where it was a complete shut down". I am sure it only made him stronger.
Red Bull now have three wins this season; with Daniel Ricciardo winning in China and Monaco and Verstappen claiming the crown in Austria - but that remains the tally so far this season.
Red Bull, however, will switch to Honda power units next year and Marko thinks that will put the team on the correct trajectory for Max Verstappen to win the Drivers' Championship in 2019 - something which will only add to the frustration of Ricciardo.
Horner was delighted with Verstappen's performance. "He's just taken his frustration out on his room by putting his fist through the wall, which you can totally relate to".
The 21-year-old is tipped to repeat last season's heroics in Mexico City, where Verstappen dominated to win the race.
Sunday was just the latest in a long line of technical problems that have blighted Ricciardo's season since he won at Monaco in May. "We've got another energy store within the allocation without having to take a penalty".
"At that altitude the engines can't breathe [as easily] and it brings it all closer together, and that gives us a chance".
"We are hopeful that it will be the same again this year, and realistically it is our last shot at winning a race between now and the end of the year".