Hmm i used it since the 865 maps, so this trick isn´t knew. If every files are the same without the meta and pna you have to change these 2 files. I know you thought that too, since the clone maps exists. For what are the tables otherwise there? Only to know that that are clones?
The greatest thing of it is, you don´t need the Clone Map. If you have a WCE and want a Europe, just rename
and on the Info screen at the Menue it was shown as Europe! Anyway it is the same map!ID=Europe.pna
Thats the same like changing the meta and pna, but more easily!