I've been looking at buying a new diff probe recently.
It strikes me that this DP10007 is not much good for off-line SMPS work as it is limited by its maximum differential and common-mode voltage specs. A typical modern off-line switcher with PFC is going to be switching about 400V and depending on the circuit topology it is fairly common to see twice that across the switch, i.e. 800V.
On the other hand, the 1300V spec of the DP10013 is possibly higher than it ideally would be, giving poor SNR.
It seems to me that the optimal is somewhere between the two. If I was Micsig I'd probably have aimed at about 850-900V.
It does lead one to wonder what the target market of the DP10007 is? Maybe they want you to buy both DP10007 and DP10013 to cover all scenarios. Sneaky.