The 5010B is technically identical to the 5010. The only difference is the missing hexagon screws in the front, which should give the 5010 the same 'look' , such as the receivers and amplifiers, but are otherwise functionless.
The 5025 has three knobs: Mic L + R / Line L + R (two smaller coaxial knobs left and center) and Master Level (larger knob, right). In addition, the 5025 has Peak Level Indicator LEDs. Mechanically and technically, it is identical to the 5010 and 5010B. The tape counter of the 5025 has a memory function (zero stop - additional switch below the counter).