How does job change affect loan approval?

[Joe Ferguson]

A new job opportunity was presented to me recently from a great company I have had my eye on for awhile. I just interviewed today and got the job :) At the same time I am ready to buy my first deal. 

I have been at current job for awhile, good salary, credit, debt-to-income, etc., and would easily qualify for a loan. I have been told by a friend that if it isn't a career change (it's not) and roughly the same pay (it is, hopefully more) the affects would be very minimal. Is this true?

The loan will be FHA or 203K. Not worried about being approved as much as getting worse rates/terms for my first deal.