HDMI Flex IO v2 expansion port

[Mth27]

Hi

I would like to upgrade my HP EliteDesk 805 G6 Desktop Mini PC with a HDMI extension port. The datasheet of the computer mentions that I can add HDMI 2.0 port, second page of the data sheet states:

"Flex IO port 1 – choose one of the following options: DisplayPort™ 1.4, HDMI 2.0, 1 SuperSpeed USB Type-C® 10Gbps signaling rate (100 W Power Delivery, DisplayPort™1.2), 1 SuperSpeed USB Type-C® 10Gbps (DisplayPort™ 1.2), 2 SuperSpeed USB Type-A 5Gbps signaling rate, VGA, 1 HP Fiber NIC (1Gbps), 1 HP Fiber NIC (100MBps), 2.5 GbE Ethernet NIC"

I tried to look up the v2 Flex IO ports available, there is a datasheet showing them all including 'HP HDMI Port Flex IO v2' with PID 13L55AA but it's specs say:

•Add an extra flexible HDMI IO to your desktops

• Supports HDMI 1.4 + HDCP 2.2 (HDR not supported on Bristol Ridge and Raven Ridge) 

Is there another port board that is HDMI 2.0? Or is this the same board just some print / specs error? Is 13L55AA able to support HDMI 2.0 - 4k @60Hz?

If not, which part I must get to have HDMI 2.0 as mentioned in computer specs?

[Mth27]

Now I see there are two options:
13L55AT
13L55AA

Anyone knows what is the difference as HPe sited do not mention the difference between them?