Disney Dreams Come true parade is more or less simply a revamped version of Share a Dream Come True. The large globes were removed off each float (with the exception of the Peter Pan/Castle float) and replaced with nicely themed arches corresponding to each float.
It also received brand new music that is much more upbeat (it is part of an arrangement for a Tokyo DL parade) and new choreography.
It is more or less the same parade with a revised look and completely different feel. Imo, the change in music made the biggest difference. Overall, I like it better than SADCT. It has real choreography rather than the characters simply walking the street and waving and it has a memorable tune with lyrics. The music is a bit repetitive, but its fun.