For both projectiles I have given them the initial velocity of 0, gravity of -9.8/60(the acceleration divided by the frames) and a current velocity of 1000.0f/ 60frames in the X axis, 0.0f in the Y axis and 500.0f/60frames in the Z axis. However, the Euler version has vectors used for the velocity and acceleration updated at each frame whereas the Newton one has pre-set values.

I have set a debug message to show the position in the X axis as both projectiles are travelling to their end destination to see compare their positions at the end of the trajectory.

The Newton version gives an end position in the X axis of 1750.000122f, and the Euler version gives an end position in the X axis of 1733.332153f.