dvSwitch color codes for uplink ports

Hi

I have a couple of distributed virtual switches with 9 member hosts (all of them BL460g7 blades with virtual connect flex-10 networking hardware)

I have observed differences between the colors of the virtual switch uplink ports depending no the host i select. Configuration is supposed to be the same in all the hosts belonging to that dvswitch, correct?

If so, what makes the difference between a green uplink port and an empty one?

2 images provided as a sample

Thanks