I think due to retstraints on size of Parade squares has a BIG impact on march past format... HMCS ONTARIO at RMC in Kingston Ontario and HMCS QUADRA in Comox BC have the exact same March past format just slightly different due to size... There is also the Cermonial Parades such as Cemermony of the Flags done at HMCS QUADRA every two weeks I believe throughout the summer..Mind you its been years for myself but I am pretty sure this hasnt changed..
This quote was taken righ tout of the manual..
Did you know that before 1968, the drill of the Navy, Army, and Air Force differed from each other? When the three services were joined together in 1968, a single drill standard was adopted. This does not mean to say, however, that elemental quirks do not still exist today.
So you need to look at before 1968 to find your answers..
Siggy