I am unable to comment on the operation of other Member States' road safety measures. However, Article 8 of Directive 2014/45/EU of the European Parliament and of the Council provides conditions regarding the proof of test issued with respect to roadworthiness testing within the EU and that Directive states “For the purpose of free circulation, each Member State shall recognise the proof provided by a testing centre or competent authority of another Member State”.
This Directive came into effect from 20 May 2018 and the proof of roadworthiness testing for commercial vehicles and their trailers in Ireland is the Commercial Vehicle Certificate of Roadworthiness (CVRT).