Super Punch-Out!! was released in North America on 1994, in Europe in 1995 and finally in Japan as part of the Nintendo Power flash RAM cartridge series in March 1998. Super Punch-Out!! is the fourth game in the Punch-Out!! series and Nintendo IRD was developing this game simultaneously with Zoda’s Revenge: StarTropics II. The game is based on Takeda’s original arcade versions of Punch-Out!! and Super Punch-Out!!. Before the game was finished and released, some screenshots of the beta seen in gaming magazines showed the protagonist of the game with a different look compared to his final version seen today. [Infos from Wikipedia]
Thanks to Celine for the scans!