DbContext and DbSet<TEntity> both contain AddRange+AddRangeAsync pairs but the documentation on all overloads states that AddRangeAsync should rarely ever been used:

This method is async only to allow special value generators, such as the one used by 'Microsoft.EntityFrameworkCore.Metadata.SqlServerValueGenerationStrategy.SequenceHiLo', to access the database asynchronously. For all other cases the non async method should be used.

https://docs.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.dbset-1.addrangeasync?view=efcore-3.1