4/5 is actually right, and 2/3 is left ... you may have it backwards, thought it would still work fine, just stereo would be reversed.
It looks like you may have pins 2 and 3 may be reversed if I read it correctly ... pin 2 should be left audio from connector on the board, pin 3 is from the CD player. You have pin 2 described as blue/white, from CD player, and pin 3, blue, going to board.
Here is a little diagram I did earlier that may have visualize the connections:

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