they are both the same ram modules.
the only difference is a cosmetic one, the platinum heatspreader
usually ddr450 with added voltage is a reality, if not more
jedec just certified ddr400, so im sure many more companies will start producing it, allowing better ram chips to be made
most of the pc3000 and 3200 chips before were just handpicked pc2700 chips which were found to run stable at higher speeds, but i think samsung is the first company who actually produced pc3200 chips (corsair uses them i believe)