Greetings! Dev Null Productions has recently published a blog series diving into technical differences between these two Blockchains. You can find the four parts on the Dev Null Productions at the links below:
Part I - Project missions, prerequisites, transaction metadata
Part II - Common Transactions
Part III - Blockchain specific transactions
Part IV - Miscellanea (transaction results, streaming, account flags, network topology, source code)
Hope you enjoy!