In the latter, there are recommendations regarding the extent and boundary and possible conflicts.
Steve Lynch may have commentary or pass this on to someone that has more experience in its use than I do
We need some additional info, please
- what version of ArcGIS?
- what does different mean, maybe a difference raster (between with boundary and without boundary)?
- did you keep the cell size the same between with boundary and without boundary interpolation?
- what are your TopoToRaster parameters?
- screen shot of your input data including the boundary outline
- what is you ultimate goal with this exercise?