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You should check with a teacher at your school to see if this would be ok. In my opinion you should be ok as long as you don't just copy your stuff from your previous experiments, and as long as you new experiment isn't too similar to your previous. Just to be safe though I would check with your teacher.
Many science fairs (not sure if all do) require students to complete a "continuation" form if their project is an exension on a previous science project they've done. It simply has you describe what is new with this project as compared to what you did on the previous project. This is used as a guide for the judges so they try to focus just on the latest work done.