That is a very strange way to phrase that question. Are you asking if 10# Ultragreen will break at the same pressure as 30# Powerpro? If so, the answer is "no".

Most float fishermen use either 20# or 30# braid to a mono leader (I use a barrell swivel between the two). The leader size will be primarily dictated by water conditions and fish. It sounds like your braid had nothing to do with you losing your fish (which is how it should go).