What a funny coincidence, my main racquet is NR800. If you change from a Head heavy to a head light racquet, you will need to adjust things. When using my astrox 100zz, I need to be really careful with net shots and short serves because it is really easy to put them too high when I have been used to playing with my NR800 racquets.
My technique for forehand drop shots is same preparation and body shape for a smash or clear, swing at the same speed, but just before the shuttle is hit you go “up and over” with your shoulder/elbow. Practice hitting at least 20 drops in a row with your replacement racquet if you know this is something you need practice with
If you are trying to do a “reverse slice” or a backhand drop, techniques will be different.