Beast, greetings.

To my understanding working visa is just plain working visa. What changes from person to person is the denomination or profession depicted in the RP.

There is some sort of agreement betwen GCC countries in which some persons holding RP with certain profession will get VISA ON ARRIVAL, others have to apply for visa beforehand to the trip and others simply don't get any visa at all.

So for example the working visa I have is the same working visa as that of the lady attending in the clothing store, or the cashier in the bank or even in the coffee shops.

Diference is in the profession denomination which could lead to some "status quo" of the person. But that's about it.

Hope it is helpful!!