How could this be possible? The only "bridge" between different projects is saving track templates or fx chains to transfer settings from one to another. Everything else would mean, you change something on your drums and save the changes directly to another project, which is - in my opinion - not possible. Because only projects with the same structure would than make sense. But how should Reaper know that? Maybe there are (or will be) ways to do so per (batch) script, but I guess this would be very error-prone because a lot of conditions must be given.
The easiest way to achieve your goal is to open the projects side by side (open new project tab) and copying everything from one to another. I guess this would be more comfortable than saving settings by chance of functionality into other projects directly.
And of course its work. But who said producing an album isn't work?
Good luck.
Greetings from cologne
Elisa