The standard DL103 has an advertised output of .3mv, and the DL103R has an advertised output of .25mv. I have had a DL103(standard) that had the .3mv output, and I currently have a DL103R that has a .27mv output which is slightly higher than advertised. They vary slightly. It is a 8.5 gram cartridge with 5cu compliance, which could be a little too much for your Sumiko Project arm. You could try it and see if it rattles your arm too much, or sets up some unwanted resonances. 103's prefer an arm that's a little on the heavier side, and it can be tough on a set of arm bearings, if there is any play. Tracks at about 2.7grams.
It is a fine cartridge, and I have loved both, but the 103R is definitely the better of the two.
It is a fine cartridge, and I have loved both, but the 103R is definitely the better of the two.