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H.264 has a High Profile which allows the use of additional coding tools like 8x8 transform. This increases Quality/Rate most of the time.
H.265 has a High Tier for Levels which potentially requires additional decoder resources and speed but has no effect on the selected Profile which specifies the available coding tools.
So if you do not hit Level Limits with H.265 there is no impact to Quality. Or you can constrain your streams to a specific Level to target a specific Decoder Class which is recommended for playback compatibility.
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