Is eggplant scripts are system dependent ?

Hey all,
I just starting using eggplant functional. 
My question is whatever scripts I wrote for automation they are system dependent is there any way to get rid of there system dependency. 
I have used image based approach first and then I switched to OCR. But in ocr again it is not able to recognize the text when I ran the script for another SUT. 
Plz help me out. 
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