Would a drone strike be more dangerous than a bird strike?
There is a numerical study on the topic at VirginiaTech, where they simulated a 5kg drone being ingested by a turbofan, some pictures related to the study below:



On the same  Aerospace America Article it can be read that:


FAA will begin testing of drone ingestion next year
The metric for danger is the density of the material, so metallic parts are more critical than the bird bones/tissues. Modern drones have more aluminum parts, but the most critical component of a Drone ingestion would be the batteries.


Comparing different sizes, a commercial quad copter is around 1.4kg, while the most frequent bird impact (from FAA database) is around 1.8kg.

This is not the worst case scenario since larger drones are commercially available, and a goose, which can weight up to 6kg.