Synchronization of two tables with SSIS

I have a scenario where i need to synchronize two tables in SSIS

  Table A is in DATABASE A and TABLE B is in DATABASE B. Both tables have same schema. I need to have a SSIS package that Synchronize TABLE A with TABLE B in Such a way That

 1. It inserts all the records That Exist in Table A into Table B     AND

 2. Update TABLE B if Same "Key" exsit in Both but Updated records in Table A

For Example    Table A and B both Contains Key = 123 both Few Columns in Table A has been Updated.

I am thinking about using Merge Joins but that helps with only insertion of New records. How i can manage to implement UPDATE thing as well

Saadat