Sounds like a loaded question. Once you format a report it should stay that way. Of course when you say 'format a report' that could cover a lot of areas like fonts, line colors, etc. so this should probably have a little more detail in the question...
You should be fine. The only advice I'd give is to stay away from color if possible as a blue on one printer could be another shade of blue on another printer (I try to only use colors in things like graphs) and try to stay away from changing fonts as much as possible as some may not be available on all of the workstations you may want to deploy to.