Is it true that a digital cable has to acclimate to your system?

"Is it true that a digital cable has to acclimate to your system? "

No.

Can these Kimber Orchid AES/EBU cables be used from DAC to Amplifier? Or should I be looking for another cable? thx

Analog only from DAC to AMP! Only if you have vol control on the DAC.

Piano lover:
What's the big hurry? All new cables need break-in. Every day your system will improve a bit and you don't have to do a thing but enjoy your own music.
Buy used cable and they're ready to go with just a short "reminder" break-in to get the electrons into parade formation.
I find that the electrons behave much better if I whip the cable with another cable of lower quality until I have raised a light perspiration on either me or the cable.

Read my article "Audiophile Law: Thou Shalt Not Overemphasize Burn In" at Dagogo.com 
I did not specifically compare digital cables but the evidence is not in favor of its changing.  

My recommendation is to never consider burn in, or break in regarding any Audiophile products. It's a great way to buy a mediocre product. 

Transparent makes one of the most beautiful sounding AES/EBU câbles bar none!