i'm not very good at this, but tried it anyway
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seems like they are pretty close, minus the pre-amp. D-Bird would be more bassy if that is a word? being that the pickups appear to be closer to the neck. I'd still like to hear an A/B!
I have a Combustion and a D-bird Standard but the pickup selector options are different (3x in my combustion so no all on, no solo middle) and I have a P-tone in the neck of the Combustion. So do they sound alike, well sort of. They do a bit but not really apples to apples, an NG3 should be much closer to the d-bird.
I've had a bit of time with the D-Bird now, the middle pickup soloed sounds a lot like a P bass to me, that and the bridge/middle parallel are great. The bridge on mine is also wired series when soloed I think (I had a quick look but not a full investigation) which makes it quite a useful setting, the sound is very balanced between the first 3 selections. The bridge actually works really well on it's own unlike every other Dingwall I've owned when it's been a bit weedy.
My Combustion is darker sounding than the D-Bird in all settings except for the 'all on' setting on the D-Bird and the bridge solo. But it's a different wood, different pickup settings and a different pickup so hardly a fair comparison.
The 'all on' setting on the D-bird sounds pretty dark to me, I personally find it way too much and won't ever use it. Others seem to love it so YMMV.
I did a few measurements for you, the pickups are a fair bit closer to the bridge on the combustion.
