they usually fall pretty close together----you can lookup all the times on this site under parks and then look under fireworks and parades. Know that busy times of the year when the crowds are big there are huge throngs of people there for spectromagic----so it takes a while to move when it is finished! Hope this helps you.
There's usually about 1/2 hr between. The exact times vary depending on time of year and day. If you don't have little ones crashing, we like to go for nights when there are two Spectromagic parades and see the second one after "Wishes" -- much less crowded!