HI!
I am not gonna get into figures here as it is almost impossible to compare the 1D1 and the 1B so direct. It would be the same comparing the 1D1 to the 2B and/or 2B1 on the B3's. We found the easiest way to work out the margins between the various Squirrels is looking at the HOGE graph at 3000ft + and 20 degrees C +. You can use the max all up loss vs height and temp to work out a percentage loss in performance. This is not directly engine related due to the MR and TR blades differences, but then that also tells a story. You can only load your blade twist as much as your engine can drive under all circumstances.