I am reading the zkSync documentation and seeing "L1 Batches" and "L1 Rollup Blocks." Are they the same thing? When a batch of transactions is sent to Ethereum as an L1 batch, how is it included in the L1 block? My assumption would be that an L1 batch is added in the same way that a transaction on the L1 is usually added rather than an L1 batch occupying an entire block on the L1.