These two features overlap a lot and it would make sense to test them together instead of creating two separate suites.

Here's a list of current suites that uses the config shard:

concurrency_sharded_with_balancer_and_config_shard.yml
concurrency_sharded_with_config_shard.yml
sharded_collections_jscore_passthrough_with_config_shard.yml
sharding_config_shard.yml
sharding_jscore_passthrough_with_config_shard.yml