Is registered ram the same as ECC ram?
No.
ECC Ram has extra memory modules in it configured to provide error correction for single bit flips, and notify against more then 2 bit flips. This makes it more reliable and more expensive then normal memory. (Bit flips can indicate faulty memory, but can also very occasionally be due to cosmic radiation)
Registered memory is a mechanism for optimizing memory transfer to the computer by adding additional circuitry