'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
They are both 1" threaded headsets so if one fits your frame the other will too.
Are you asking if the bearing cartridges are interchangable so you don't have to change the cups? If so, the answer is no. Google searches on both headset models gave the following information:
The 7400 headset used 20 - 3/16" loose bearings balls in each race while the 7410 is a cartridge bearing headset so they are not at all the same.
The do have similar stack heights at 37.6 mm for the 7410 and 36.3 mm for the 7400 so your current steerer length should be fine but you will have to change the entire headset, cups, crown race and all, if you buy the 7400.