UCD3138A: What is max and min page programming time of PFLASH or DFLASH ?

The flash control is just determined by the processor clock speed. There's no variation due to flash characteristics. So really the number should vary only with the clock speed variation, which is in each data sheet. Of course, there will also be firmware overhead as well.

The UCD family parts use a different approach than the MSP432 or the C2000 devices.  The FLASH write and erase operations are done entirely in hardware, and enough time is always allocated to permit full programming at all stages of FLASH life.  So, as I said, the variation will be a function of clock variation.  The UCD flashes are custom flashes for the UCD.  They are specially designed for UCD requirements, including the need to run and retain data at 125 degrees C. 

The other devices you mention require software control of the erase and write process, including verification and retry if the programming is not complete.  This is not required on the UCD, and the programming times are deterministic, not variable.