Pen testing and empyment

Hi,

Can anyone help. I have been involved in system testing for about the last 18 
months, and would now like to work as a pent tester. 

I am applying for junoir pentest roles and they are ask me if I have any pen 
test expeirence, I tell them what I have done and then they ask me for my CV. 

After receiveing my CV their tell me that I have no pentesting experince. I 
suppose what I would like to know is:

Is a pen testing and a system testing one and the same or are they different, 
because after a qiuck search on the net they to me appear to be the same. 

Can any one answer my question.

Thanks

Lee  

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