yes, we could help explaining to all our customers what the meaning of TR-10KS for part number SHTC3-TR-10KS is:
the full Tape and Reel number of parts as (TR) with 10K unitS and with a large 330 mm (13 inch) diameter Reel.
As some final customers only talk about the SHTC3 core part number it’s a matter of their really needed quantity, if they prefer handling the SHTC3-TR-2.5KS with a full Tape and Reel number of parts as (TR) with 2.5k units and the smaller 180 mm (7 inch) diameter Reel, depending on their assembly automation equipment for soldering to the PCB.
Please review the datasheets to ensure the alternative will work for your application.