Replace the video edit with another video keeping the in and out timings
A possible workaround:


Open the new clip in its own project.
Set the "in" point and the "out" point.
Export that as a new clip (with lossless video quality, if you can pull that off).
Open your other project.
Use Replace Clip from Bin, and replace it with the clip you just exported.  In the new clip, the "in" point is the beginning of the clip!