In this book, Dickens shows many christian symbols. As for France, he shows that it is being resurrected and turning into a better place by getting rid of the monarchy. But the sacrifice was all the innocent people's lives that were lost so that France could become greater.
Structure is probably the same with both eras in poetry. It still has that lyrical or rhyming flow and it follows short stanzas with usually 4 sentences each. The only difference is the current societal situations that each era faced. Both have the same structure but the difference is in their content based on the observations of writers found in specific eras.