


It should all behave the same when you connect the Thunderbolt 2 dock to a Thunderbolt 3 computer using the Thunderbolt 3 to Thunderbolt 2 adapter. The other connects via DisplayPort from the second Thunderbolt 2 port. They will be limited to 4K 30Hz or 2560x1600 60Hz. It sounds like you have two HP monitors connected to a StarTech Thunderbolt 2 dock.

You'll need to connect your Thunderbolt 2 cable between the Thunderbolt 2 dock and the Thunderbolt 3 to Thunderbolt 2 adapter. Yes, you can use this adapter to connect a Thunderbolt 2 dock with two displays to a 2018 13" MacBook Pro.
