No, you are not. An X step is very specific. In all run ups, the weak foot crosses behind the strong foot. Body mechanics demand this, it is not optional.
In an X Step, the feet move off line in an X pattern whilst the body stays, mostly, on the line, with the disc staying in one spot in the air until the pull is started. Bent arm throwers will move the disc off line a bit, but other than that, theirs is the same as a full reach back.
If one are not doing all of the above, then it is not an X Step.
In a scissor step, the weak foot 'sweeps' inline, where the X step the weak foot steps off line. To get the hips engaged, the scissor step's weak foot must penetrate deeper towards the target than what the X step has to..
In a backwards run up, one turns their back towards the target before the weak foot steps through.
In a crow hop, the weak foot passes behind the strong foot whilst the strong foot is in the air.
All 4 run ups start the same and end the same, it is how the body transitions through the movement is what makes the run ups different.
This needs to be it's own thread; I probably should have prerubed myself, it seems that this has already been argued before.