Part query

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Does anybody know the difference between these two Z7U-734 references above? One has three arrows in black box, the other has three arrows without a box. Is this to do with water or air cooled turbo ??

[BIG_MVS]

I think it refers to Air Con cars but ready to be enlightened

Black square with white arrows in a circular patern is without A/C
Black arrows in a circular pattern is with A/C

If they have vertical wavy arrows it means Regulated A/C

Many thanks, I wanted to make sure I asked Stephen for the correct part number on the 'last buy parts' thread.