Clarification required on URTs

Document ID : KB000093037
Last Modified Date : 04/05/2018
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Question:
Are URTs linked under a previous version (possibly R11 or before) upwardly compatible with R15? I don't have all the source in CUSMAC in order to re-link , therefore need to know whether I can copy the CUSLIB from R14 to R15 so it will contain the URTs . Note this is the approach we took when we upgraded to R14, we copied over the URT cuslib from R11 to R14 .
Environment:
z/os, CA Datacom/DB 14.0 and over
Answer:
Yes, it will work since:

 URTs are upward compatible.