So, I purchased a new 913D2 driver with a Titleist Diamana 'ilima 61 shaft  (specs below) and I would like to set it up to get it close to the swing weight of a 913D2 driver with a Titleist  Bassara W-series 50 R. Only problem is, I don't know the swing weight of either driver. I like the swing weight of the Bassara 913D2 and would like to adjust the head weight of the driver I purchased to be of a similar swing weight.

Anyone know if I can use a lighter weight in the head to reduce swing weight to get it to feel similar to the 913D2 with a Bassara 50 shaft? Do the two drivers have similar swing weights? I haven't received my new driver yet, but I'm assuming the heavier shaft will make for a heavier swing weight. Specs below!

Driver that I purchased:

Model: 913D2

Shaft: Titleist Diamana 'ilima 61 - regular flex

Shaft Weight: 58 grams

Length: 45"

Grip: Standard

Head Weight: 9 gram - red dot

Swing Weight: ????? (would like it to be a similar swing weight to the driver listed below)

Driver that I like the swing weight of

Model: 913D2

Shaft: Titleist Bassara W Series 50 - regular flex

Shaft Weight: 49 grams

Length: 45"

Grip: Standard

Head Weight: 9 gram - red dot

Swing Weight: ????

Thanks!