if the objects are identical, in C4d you can UV one of the objects and then copy the UV tag onto the other objects.
At least I think this should work, you would have to check that the point index is identical in all the objects.
Quickest way to assign the tag is to group all objects, copy the UV tag to the null parent, then use then 'assign tag to children' command.

It's been a while since I have done any UV mapping in C4d, so this may not work.

It this does not work, there are some workflow tricks to quickly replace a set of objects by instances, then replace the reference object from these in one go, so that all the instances are referencing on single mesh.