Scanned PDF file data extraction

Below the steps which are performed
Step : 1
I have created a process to read the scanned PDF file using the activity (“Read PDF with OCR” - Microsoft OCR) and extracted the output into text file. Developed the process in Uipath studio 2018.1.4. version

Step : 2
I have copied the same process to another server having the Uipath studio 2017 version and extracted the output into text file.

Both the extracted data are varied,but same PDF scanned document and same process file(.xaml)
Is this because of different version of Uipath studio ?
Anyone suggest us like what are all the prerequisites which needs to be taken care before moving Scanned PDF extraction process to another server?
Is the PDF reader is mandatory to install it in both the uipath studio servers?

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