This page explains in detail the interactions between the Donkey Kong series and the Konami's Ping Pong series.
Smash Ping Pong[]
May 30, 1987
Donkey Kong Jr. in Smash Ping Pong.
Donket Kong
Konami's Ping Pong
In the Famicom Disk System version of Konami's Ping Pong, titled Smash Ping Pong, Pentarou's cameo in the audience is replaced by a cameo of Donkey Kong Jr. Like Pentarou, he's on the player's side, cheering when the player score a point, but for some reason the audience sides were switched in this version, so he appears on the right rather than on the left.
Additionally Pentarou's appearance in the title screen is replaced by Diskun, the Famicom Disk System mascot, totally removing the penguin from the game.
License[]
The Famicom Disk System version of Konami's Ping Pong was licensed by Konami, but produced by Nintendo, so they could freely use Donkey Kong Jr.