I would actually suggest you make a free request for the Carrier Card SOURCE files through your FAE. This way you can not only get the trace lengths, but utilize that design as a starting base for your own customer carrier card.
In the mean time, we use this as a guide for layout on our boards:
"Trace length matching to within 10mils pair to pair and do not to exceed 100mils within the group."
We have a TABLE of signals for the SOM, listed in the Carrier Card Designers Guide. In this case, it has a confusing title of "UltraZed_EG_SOM_Designers_Guide_v1_1" and Confusing file name of 5290-DG-AES-EG-SOM-V1.pdf
