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Lke Don Cragun stated, be careful before you run rm:

find . -type f \( -iname "*.xml" \) -printf '%T@ %p\n' |
sort -rg |
sed -r 's/[^ ]* //' |
awk '{w=$0; sub(".*/", "", w);...

find . -type f \( -iname "*.xml" \) -printf '%T@ %p\n' | sort -rg | sed -r 's/[^ ]* //' | awk '{w=$0; sub(".*/", "", w); sub("_[0-9_][0-9_]*.*", "", w);} !a[w]++'

Untested, but should be close to what you need. If the list of rm commands produced by the following looks correct, remove the echo and run it again to actually remove the files:
#!/bin/bash
ls -t...