Having used a couple of 16Xs and three 6-24s(Always set @ 18X so they are MOA instead of mills) for many years the 3-18 I have is not the same scope. Its not bad by any means but not as sharp or bright as the others.
I bought the 3-18 for a long range big game scope and went with the 3-18 over the 4-14 for its ability to be able to use the MP-8 in MOA rather than mills....It was cheaper as I bought it used too
The bright issue is not a problem with the 3-18 as it works good enough to judge horns @ dusk and dawn.
If you already have and like the 4-14 and you use the MP-8 reticle for holdovers you might want to get another one as the reticle would work the same as the one you have.....The 3-18 is Mills @ 10X and MOA @ 18X, not sure about the 4-14 but is gonna be different!