for the jaa Cpl to easa Cpl , its just a paper exercise and a fee , plus class 1 medical that's up to date . they will issue an easa Cpl .
BUT if you want to fly on the easa Cpl , you have to have a valid single and be current . no Cpl skills test but if you haven't flown for a few years there would be a navigation exercise in addition to basic handling etc , then single engine rating test , might be on a par with the Cpl skills test.
not sure about ME/IR , I assume full skills test for this.
I finished in 2008 ,never made it , everything expired , but I converted the jaa Cpl to an easa Cpl just to keep it for life . if I want to go back flying for fun , its a single engine rating plus nav.