The FCOM tells you that
“All actions performed on the FCU and MCDU must be checked on the PFD and ND ( eg.:,”FL350 blue”, “ FL200 magenta”.
My understanding and this is how the training department interprets in my outfit: This is just a visual check. They don’t ask you to announce the color. If we are clear to climb to a new altitude or speed, the PF will announce “Thrust Climb, Climb, Alt blue, FL330”. If it’s a speed, he will announce “ speed managed”(if previously in selected speed)or “speed pull 270 kt”( or “speed 270 kt “ if already in selected mode at a different speed )or just “speed pull” if you just pull the speed and no change is made to the speed)
But the FCOM states that:
the PF should call out any FMA change., -All armed mode with the associated color and all active mode without the associated color.
Only These items are mandatory call out. The altitude value and speed are not considered part of the FMA.
We follow the FCOM. We just have a note in our FOM stating that it’s not required to read the color of the number.