If the green peppercorns are dry, use same volume white or to taste. Green are unripe and white are mature, polished from same plant. Here's an article which compares them on production and taste.
http://www.thekitchn.com/whats-the-deal-with-green-blac-93231
If the green peppercorns called for are pickled and used as garnish or flavoring, you might want to substitute capers or finely chopped pickle...
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http://www.thekitchn.com/whats-the-deal-with-green-blac-93231
If the green peppercorns called for are pickled and used as garnish or flavoring, you might want to substitute capers or finely chopped pickle...