It is probably possible, but I don't know how much changed and must be updated. Here is an example of what we did to update to v1.12.3:
https://github.com/matlabbe/rtabmap_drone_example/commit/f13b40dcea986dce2f725ceebc3316ec00cfa664#diff-42dbc74deb621fb8378c62ccbdf15624059f987d5982477a4f82ad75ae348066The main changes I think related to px4 were the files
1099_iris_rtabmap and
rcS. Note however that in that commit, the changes were mainly coming from a copy paste from the latest corresponding files on px4 repo.
Another way to migrate is to first launch the basic iris example from px4 repo, then update the changes related to vslam.