I can't say for certain, as I haven't tried the ddrum3/4 pads. But essentially all but the Roland Digital pads work on a similar system, piezo transducers that detect vibration, sent down a cable and the module interprets it. Even the Roland digital pads use piezos, just transferred into the module via USB instead. I know that's a very broad generalisation.
The only thing that might be an issue, is that they might be too hot a signal for the drumit3. But thankfully, the new modules (drumit3 and drumit5 mk2) have a gain reduction.
I honestly think they'll work great. You will have to find the optimum trigger type, adjust the gain, curve and all that stuff. At a guess, Trig PadPP would be my go to.
I do think they're better built pads than the speedlight ones. But a country mile.
Will be interested to find out if you went for it and how it turned out.
Sorry it's not a definite answer.