It will make a difference. But likely very little, and probably even imperceptible. Many assume that the smallest hole in the entire pathway through a tank dictates the amount of flow you'll get, but this isn't true. The entire pathway contributes to determining the flow - from the intake, to the port below the coil, to the overall volume of the tank, and the tip itself.
If you want to do an experiment to prove it to yourself without reading data from engineers, try this: Take a sizeable length of poly tubing, like you'd use for an icemaker installation. Try a DL through a whole roll of 12 feet of it, and feel how restricted it is. Then cut a 1/2" length piece of it, and take another draw....huge difference, yet it's 1/4" all the way through.
But to your question: you probably won't notice the difference in a wider tip in the Zenith. Zenith wide open is pretty airy for MTL, but it won't turn it into a cloud machine. Still probably worth a try, though - tips are cheap, and you might like a new one better regardless.
Oh, and I'll keep preaching this: One day, tank manufacturers will give us pressure ratings for tanks at their various settings, instead of us having to do the mental exercise of comparing port sizes, AF intakes, and asking "is that tank tighter than a ________ tank?"