A TRAY version is a product without original packaging or accessories, i.e. only the CPU (no cooler -> also stated in the description), usually ordered individually and shipped in a plastic bag + bubble wrap.
--> Of course, there is a small residual risk that the pins could be bent during transport (according to previous experience with tray CPUs).

However, there are no further differences to the non-tray Ryzen 5 5600G (warranty also 36 months in both cases).