What does the TR suffix in CNC Tech 3220-20-0300-00-TR mean?

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What is the difference between CNC Tech part numbers 3220-20-0300-00 and 3220-20-0300-00-TR?

The TR is a packaging code.
TR = Tape & Reel Packaging.
Without the TR = Tray packaging.

So these will be the same exact parts, just packaged differently.