should the lead guitarist and rhythm g. have the same pedals?, and should the Lead be louder than the rhythm? I've heard that both, that they should be balanced and the lead should be a bit louder.
Should be fairley balenced, but the Lead a touch higher. And pedal's will only really change the sound. Not a significant volume increase.
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It depends on the importance of both parts.

If the rhythm plays equally main parts as the lead then they should be equally loud but play quieter on others