One and the same.
From
http://en.wikipedia.org/wiki/DDR_SDRAMPC3200 is DDR SDRAM specified to operate at 200 MHz using DDR-400 chips with a bandwidth of 3,200 MB/s. As DDR stands for Double Data Rate this means that the effective clock rate of PC3200 memory is 400 MHz.
1 GB PC3200 non-ECC modules are usually made with sixteen 512 Mbits chips, 8 down each side (512 Mbit x 16 chips) / (8 bits (per Byte)) = 1024 MBytes. The individual chips making up a 1 GByte memory module are usually organized with 64 Mbits and a data width of 8 bits for each chip, commonly expressed as 64M x 8. Memory manufactured in this way is low density RAM and will usually be compatible with any motherboard specifying PC3200 DDR-400 memory.