Staining mixed decking

I recently replaced about a third of my decking with pressure treated wood.  The lumber supply store delivered  brown pressure treated wood but there are a couple of pieces I used that are far less brown.  The original decking is cedar.  With these different types of wood ( cedar/ p.t;  old/new) - what would be the best treatment or stain to make them all blend in together?  I suppose I could paint the boards to blend everything in but I know that paint doesn't last as long.

I live in the Toronto, Canada area.

Thanks for any help or advice you can offer!