Component Identification AHC373
According to the Texas Instruments datasheet, the only difference between the two part numbers is how the chips are packaged:



The actual chips themselves are identical. They're both octal transparent D-type latches in a 20-SOIC package.

If you are hand-soldering or doing a small-batch, they are completely interchangeable.

If you are doing a large-scale assembly using automated equipment, you'll choose the -DWR part if your assembler/machine expects the parts on tape-and-reel and -DW if the machine expects to be fed from a tube.