IF I got this right:
You want to copy a track from one project to another and want the routings be connected to the same tracks-indexes. Like if it connected with track 3 it will connect in track 3 with the same settings.
I think you will need a script for that as reaper delete send/recieve
If you dont want to code from scratch you can just set the same chunk from track in project1 on the new track on project2 it should work! I would use amagalma chunk editor for that. PS: the chunk only saves track receives