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  I would not worry and I would not force them on each other.  Give each their own space until they prove to you that they want to share.  This means crates, ex-pens, food dishes, water, toys, everything.  Whenever you go to do something with/to your Yorkie's your oldest comes first.  First to be fed, first to be loved, first to be played with.  Try to include both in a fun game if you can.  This takes time, let them determine how long.  This is what I did with Gracie and Holly and now they are the best of friends.  
				__________________Gracie loves Bailey. Holly loves Tucker. Proud member of the YT Gracie Girls.
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