Sort of - depending on what you mean. Offset is related to the halfway point of the wheel and whether it's positive or negative -- offset is the more complex of the measurements and gets a lot of people confused. Backspacing is the more simple (and usable) measurement from the edge of the wheel to the mounting surface. So a smaller backspacing will make the tires stick out more, which gives more clearance between tires and suspension components, but you might risk the tires rubbing more at the rear of the front wheel wells during cornering.

Someone else will know about the exact tire/wheel/vehicle combination you have, but what you're trying to accomplish with those wheels sounds about right to me. You will probably need to get out the big hammer for the body seam in the front wheel wells.