Are you sure about this ?
I was pretty certain that the 11 triple crown winners all won the same sequence of races over the same trip at the same time of the year.
Since 1931, the order of Triple Crown races has been the Kentucky Derby first, followed by the Preakness Stakes, and then the Belmont Stakes. Prior to 1931, eleven times the Preakness was run before the Derby. On May 12, 1917 and again on May 13, 1922, the Preakness and the Derby were run on the same day. On eleven occasions, the Belmont Stakes was run before the Preakness Stakes.
The Kentucky Derby is now always held on the first Saturday in May; the Preakness Stakes is held two weeks later; and the Belmont Stakes is held three weeks after the Preakness.
From 1875 to 1895 the Kentucky Derby was run over 2400m. It has been 2000m since 1896. It was run in mid-May until 1933 when it was brought forward to the first week in May.
The Preakness was first run in 1873 at Pimlico, Maryland. In 1890 it was moved to Morris Park (The Bronx) New York and from 1894 to 1908 it was run at Gravesend Race Course, Coney Island, New York. In 1909 it was returned to Pimlico. The Preakness has been run over many distances: 1873-1888,1890 (2410m); 1889 (2010m); 1894-1900, 1908 (1710m); 1901-1907 (1670m); 1909-1910 (1610m); 1911-1924 (1810m); since 1925 (1910m)
The Belmont Stakes was run at a mile and five furlongs from 1867 to 1873; a mile and a quarter in 1890, 1891, 1892, 1895, 1904 and 1905; a mile and a furlong in 1893 and 1894; a mile and three furlongs from 1896 to 1903 and from 1906 to 1925. The current distance of a mile and half was established in 1926.
The race was run at Jerome Park Racecourse, The Bronx, New York from 1867 to 1889. In 1890 it moved to Morris Park also in the Bronx and in 1905 it moved to Belmont. It was run in a clockwise direction from 1867 to 1920. From 1921 it changed to anticlockwise.
Only Sir Barton (1919) and Gallant Fox (1930) won the Triple Crown prior to the current order being set in stone in 1931 although all three races have been running since 1875; the Kentucky Derby being the youngest of the three.
Sir Barton won his Preakness over 1810m and won his Belmont Stakes running clockwise as opposed to the current direction.