Hi!
Did you realize there are two different titles for the land before time 10? It was first released as "The Great Longneck Migration". Meanwhile however it is often called just "The Great Migration" (dropping the longneck). I recall that the first source about LBT 10 we ever had also named it simply "The Great Migration". There are also two slightly different cover versions. The differences are not so distinct as in case of LBT 3 and other LBT movies with different covers. The motives are the same, but the cover with the long title "The Great Longneck Migration" (it can be looked at at http://www.landbeforetime.com/dino_movies.html has a purple sky in the background, a thin river with a waterfall on the right.
The cover with the shortened title "The Great Migration" (to be found for example at http://global.yesasia.com/en/prdGrpDept.aspx/pid-1003543514/section-anime/code-w/version-all/did-7936/) has a blue sky in the background, a broader river, no waterfall and a different arrangement of longnecks in the background. I wonder if the cover versions depend on the country. The first cover version (which I consider the better of the two) was for example on the US version of the DvD while the Australian and German DvDs feature the second version.