Equivalent component (Variable Resistor)

There is four variable resistor that is needed in this Body Detector circuit, which is one variable resistor with value 200ohm-500ohm multi turn wire wound potentiometer, one variable resistor 470k type of vertical sub-miniature carbon preset, linear cermet preset 100ppm degree temperature coefficient and the last variable resistor is two type of multi turn horizontal cermet preset with value of 50k. Among this four potentiometer, there is two of it we change with the another equivalent components which is VR2 and VR3 50k. We change this components because it is not enough spacing to put it in the PCB board. Since we combining the two part of the board circuit to become one board, it make the size of the PCB board smaller than the actual size. So that, we find another variable resistor 50k that equivalent and same function with the actual components to replace it. The biggest different between this two type of variable resistor is by the colour and size. The actual variable resistor is in red colour and it is big size. However for the replacing component of variable resistor is more smaller and it is yellow colour. This variable resistor can be turn into the maximum turning of 50k. Here the figure of the component.