Same card - yes  
 
WWWF @ New York City, NY - Madison Square Garden - March 1, 1976
Televised on the MSG Network - featured Vince McMahon on commentary
Rocky Tamayo defeated Johnny Rivera
Dominic DeNucci defeated Baron Mikel Scicluna
Ric Flair pinned Pete Sanchez at 10:05 with a suplex (Flair's MSG debut) (The Ultimate Ric Flair Collection)
Louis Cyr pinned Pat Barrett at 11:05 with a backbreaker
Superstar Billy Graham & Ivan Koloff defeated WWWF Tag Team Champions Tony Parisi & Louis Cerdan in a Best 2 out of 3 falls match at around the 18-minute mark; fall #1 - both teams were disqualified at 11:58 when all four men began fighting in the ring and the champions attempted to make double pins; fall #2 - the champions were disqualified when Bruno Sammartino interfered and attacked both challengers, clearing them from the ring; prior to the bout, the Grand Wizard escorted Graham to the ring while Capt. Lou Albano did the same for Koloff; during the contest, Graham & Koloff "injured" Cerdan's leg, with the challengers then double teaming Parisi until Parisi's cousin, Sammartino, made the save
WWWF World Champion Bruno Sammartino pinned Ernie Ladd at 11:25 after the challenger missed a splash off the top; prior to the bout, the champion was escorted to the ring by Arnold Skaaland
Susan Green pinned Kitty Adams (sub. for Women's Champion the Fabulous Moolah) at 9:21; Moolah was deemed unable to compete after breaking her collerbone the previous night in Toronto
US Champion Bobo Brazil pinned Crusher Blackwell with the Coco Butt at 8:22  
 
As to them wrestling eachother, the only time it could've happened would I guess be on one of Brunos trips to AWA country when Flair was starting about, but I still think it probably never happened

Thanks guys!