First, you can remove any filters from a clip in the timeline, by control clicking on the clip in the timeline and choosing "remove attributes" clicking on filters and hitting ok. This will remove all filters applied to the clip.
You can also double click on the clip in the timeline which loads it into the viewer and in the viewer filter tab, select any filter and hit delete.
there's also usually a reset button in the filter tab to reset the filter to it's original settings.
Which color correction filter are you using? I recommend the 3-way color correct. Learning to read video scopes and then using the scopes as a reference and trying to match the scopes for the 2 shots is often a good way to start.
You might also try sending the sequence to color which has a much more sophisticated tool set (and a much larger learning curve).