Is one of these two down jackets warmer?

I’m comparing two Macpac light down jackets. Is there a way to work out how much warmer one jacket is compared to another based on the down fill power and weight of down? These are the two I’m comparing:
1. Mercury: 650 fill power duck down. 154g of down in the jacket.
2. Icefall: 800 fill power goose down. 96g of down in the jacket. There is actually 88g of down plus prima loft synthetic in the shoulders, cuffs and chin - but since the previous model of this jacket without the primaloft has 96g of down, I'm guessing the down/prima loft combo in this jacket possibly equates to 96g of overall).
1. Mercury: 650 fill power duck down. 154g of down in the jacket.
2. Icefall: 800 fill power goose down. 96g of down in the jacket. There is actually 88g of down plus prima loft synthetic in the shoulders, cuffs and chin - but since the previous model of this jacket without the primaloft has 96g of down, I'm guessing the down/prima loft combo in this jacket possibly equates to 96g of overall).