I have two projects both the same thing except ones duration is a 1000 frames and the other one is 300 frames. Now this may be a stupid question but I need some advice. I have a movement occuring in both projects from frame 0 till 288. Both the movements are in the postion channel and for both projects the coordinates are the same. Now I noticed That there is a speed difference in both. Wheb u change the duration of frames does the speed get affected as well?? Even if the coordinates are the same?
No, length of the timeline has no effect on speed. Are you seeing the speed difference in the viewport or in rendered output? If it's in the viewport it's probably just due to different cpu/gpu load. You can eliminate that effect by allowing Cinema to skip frames to maintain accurate fps.
If it's a difference in rendered output then you probably have different fps settings between the two scenes (set in both project settings and render settings).