Hello Deepak,
My guess is MBA(IT) deals with management of IT systems. PPM deals with profile and project systems management of functional area like SD,PP...etc by using software(IT). I felt they are logically they are much related.
Other than that you can even try using SD, PP. MM..etc but there are people already available in market. You can try even basis with particular eye on linux(as you already working unix) or some course where there is scarcity for skilled resources.
Personally, I don't believe in experience, as it maturity in knowledge. Try to get maturity knowledge you will win. These my few pennies ..... sorry rupees 
Thanks,
Kolusu