Examine the contents list on the back of the pack and compare them. Personally I would not risk it as the problem is that guinea pigs do not pouch food but hamies do. Hamster treats are made to a special consistancy that will not melt in the pouches and bung them up. Even if the contents do look similar the melting point may make them unsafe for hammies. Maybe you could keep them and exchange them next visit. I doubt they would make them in separate packs if they were suitable for all small rodents.
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