I was not issued with a new 61.75, but it was revalidated and reissued on the new UK License.
But, you didn't have a new UK licence. You always had a UK licence the only change being that the European Commission words could be removed from the cover. The same for the UK passports. This would only happen if the licence was lost, damaged or a new rating was added etc. Until then the words can be ignored. The number didn't change, as you say, even on reissue