The reason Amstrad released a special version for the spanish market was a law that said that every computer with up to 64kb should adhere to some rules - namely, have extra keys for the spanish language. So Amstrad soldered in an extra 8kb which was not, however, usable by the machine since it was not connected to anything else.
After the rule changed there was also a CPC 472 with non-spanish keys available for a very short time. The CPC 472 with spanish or british keyboard is very very rare and people are paying up to 450 Euros for a CPC 472 in a mint condition.