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HD3SS215: HD3SS215IRTQR and TS3DV642A0RUAR differences

Part Number: HD3SS215

Hi

We want to be the Switcher of 4K@60HZ HDMI.

I want to use HD3SS215IRTQR and TS3DV642A0RUAR.

What are the main differences between these two?  Which one is recommended?

Thank you.