3118 is for the 400 amp
3135 is for the 200 amp or 100 amp.
3119 is for the 100 amp
There are several others, such as N3114 having the same NSN as N3117, and both of those working in place of the 3135 on the 200 amp, though I believe the N3135 is a newer version.
So to answer why not, because...