The brakes are not a direct swap over, there are a few more things that you can do. They are not just "well they are out of pads for the sol, lets pick up the GSR ones" Does not work that way. You will need to change calipers, brackets and a few other things.
For suspenion peices, yes they are all basicly the same. The integra's will normally be a bit thicker. For things like sway bars, if your car did not come with one, you need the integra LCA's because they have the holes to mount the endlinks for the sway. Strut bars, yes they go on with no problem. Shocks are the same except for the Type R's. If you want to put type R's in you civic, you need to buy ITR LCA's (they are massive compared to normal teg's)