Why would you expect them to be the same? The 5C has the processor of the 5; the 5S has the A7,M7, fingerprint, camera..
Still, it's time for them to start upping the storage space for our $200. They are upgrading everything else... Why not storage? Storage prices are coming down so it would be a nice gesture for them to start making 32GB the base model at $199.00, 64GB at $299, and 128GB at $399. I'm probably skipping this model so it won't really affect me but I hope they bump up the storage on the iPhone 6.