Not sure about the difference in fomular made in different countries. But I think opticpro, baby poo should be yellow and opticpro HA then should be green cause of the iron content. I asked nestle before cause my newborn had green poo after changing to Opticpro HA. now we change her to Opticpro, her poo is yellow now. you can call Nestle hotline to ask on your query better. 800 601 1633
You can have an idea about colour of baby poop and reason here: https://sg.theasianparent.com/baby-poop-guide
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