difference between canon pg-30 and pg-40 ink

Hello,
I have Canon MP210 All in one. I am about to purchase refill ink for the same. I understand that PG-30 and PG-40 are compatible Blank inks. I am confused as to what is the difference as there is approximately $3 difference between each.

Thank you
nainilAsked:
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hdhondtCommented:
However, according to the data sheet, these are the ink cartridges the MP210 takes: PG-37, CL-38 (optional PG-40, CL-41). See:

http://www.canon.com.au/ftp/printers/pixma%20-%20mp210%20tech%20sheet.pdf
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