How to replace groups by a component?

Hello there. I received this heavy model and I need to make lighter. Those little balls are very heavy and I need to replace them. The problem is that all of them are groups and not components so I can automatically replace them. Are there any plug in to make it possible?

Selection Toys, assuming they are all the same.

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yes they are! thank you very much. I wish skp could have all this options by default…