Coupled inductor/pulse transformer for very tiny power supply
There is no fundamental difference between all ferrite-core inductive devices. But each series usually tailored/optimized for specific application. For example, for signal conditioning such parameters as impedance, frequency response, linearity are of value. On the other side, for power conversion, DC resistance, max (saturation) current are important. So, datasheets usually provide data relative to application field.
Let's go back to your questions.
"Мaximum input voltage" – which voltage do you mean: peak voltage across single winding terminals? Or between different windings? Latter parameter is provided in both mentioned datasheets as 'isolation voltage'. Former one rarely mentioned in specs, but it can be estimated to be the same order as 'isolation'.
"Frequency response" – in my opinion, it's weird parameter for power conversion applications.
"LI² values" – may be estimated either from L and Imax or from L and Vus values.
For your specific application (small power converter) there is no need to use inductive device close to the limits, so even ballpark estimations of needed parameters would be quite enough, I think.