Official gene symbols and gene ids remain the same between different assemblies for example, mm9 and mm10. There may be a few cases where a RIKEN clone may have been given a new name OR assigned to one of the already existing genes. Otherwise most of the gene names won't change between mm9 and mm10.

You can get the mm9 coordinates of the genes, then use this to convert the coordinates to mm10 and then get the annotations from there