Were Gale and Pryce meant to be similar characters?

Both Gale and Pryce were people involved in the legitimate world of "chemistry" who both without any pressure became involved in criminal activities. They had, I think, similar personalities although Gale was much brighter and savvier.
They both got burnt, one more severely than the other. I wonder why have two such characters?
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Roma rips into Williamson – Glengarry Glen Ross (1992)
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Images: Kelly L, Maria Orlova, Damir Mijailovic, Angela Roma