There are two possibilities here.
Firstly, the second drawing is on the same grid as the first drawing, so do not specify an insertion point.
Secondly, the second drawing is on a totally different grid, and specifying an insertion point of 0,0 throws it way out of whack.
Open the second drawing and try to find a common point between it and the first drawing. Note the coords of that point on both drawings. Then you have a better chance. Get back to us if you still have problems.