Is there a way to tell which UDC's are updated in an ESU?

I have taken an ESU and applied it to DV and PY.  PY was then refreshed with data from PD, which overwrote my UDC tables, including the new entries from the ESU.

Is there a way that i can tell whcih UDC was updated from looking at the information in the ESU itself?  If so, i can then just update the UDC in py;

Or perhaps i can re-apply the ESU to PY, running only the UDC table merge? That could be another option. If so, how would i do that?

Thank you.