Are DDR3 SDRAM's DQL and DQU pins different?
You cannot stop your efforts only because a minor difference in the names. OK, so Alliance calls its data pins DQU and DQL, and AllWinner calls them SDQ. But from analyzing the datasheet it should be obvious for you that they are all data pins, 8 DQU and 8 DQL for the memory, 32 SDQ for the processor. Similarly you can solve the case for all the pins, not by their names, but by their functionality. If still in doubt, try to find a reference design for the processor (and the memory).