really that is about it...
There are slightly different manuevers but they are quite similar.

Pattern planes are purpose built RC planes that must be under 11lbs and fit in a 2m by 2m box....

IMAC has no size or weight limit. The planes must be "scale" models of full scale aircraft capable of flying in the aerobatic box....

There are unique rules for each organization, but overall they are quite similar.......