It's not quite the same as searching the individual sites.
The global / Eu.... search facility only returns items that the lister has identified for sale to your location.
Whilst this is probably what you want it can be useful to know how it works.
I've bought items from Germany ( by searching the .de site) which were listed as not being available outside Germany by contacting the buyer and asking if he would ship to UK.
Conversely I've listed items for sale as Uk only and received questions from potential buyers outside UK.