True Blue is bang on in what he is saying regarding the extra letters at the end of Panasonic's products.
In regards to the SC-BT200 and SC-BT200EB-K, both are the same apart from the SC-BT200 does not state if it's a UK model or a import one as it has no extra letters at the end of the model number, some retailers dont bother with the end prefix just to keep things short or everyone refers to the kit as the SC-BT200 only, if you find one of these then you are best to ask the question and make sure what the end letters are. Where in regards to the SC-BT200EB-K model, that is the UK model as the EB-K is a UK prefix.
Regards> M