913 swing weight

I currently play the 910 d2 with 72 gram 'ahina shaft.  I switched the stock weight (red) with the lighter 2g (white).  I'd like to switch to the 913 d2 with the D+ 72 shaft.  What weight do I need to use to keep the same swing weight?  Thanks.

When you made that bezel weight change to your 910, the swing weight moved to D1.  If you were to switch to the 913 with the D+ 72g shaft, then you can request the lightest bezel weight (4g) to match that D1 swing weight.