This is an example screenshot of the DS1054Z's math output (M = Ch2 - Ch3):
This is not a pleasant result at all, and doesn't allow for any insight into what's actually going on. My hope is that a differential probe will give me a clearer picture AND free one of the scope's channels at the same time.
The differential signals I'm looking into are a BLDC motor's feedback voltages and its virtual center, divided down to 3V3 (absolute) or 1V2 (differential) for a differential ADC with 1V2 reference. So I asked Bud if he'd help me with adapting his probe to my needs, and bud was very helpful.
This modification might not have been necessary, but I'll only now if I also built the 10x probe to compare their resolution at low differential input voltages. However, building it the way it is now was fun nonetheless and I now have a working differential probe.