Hi, can anyone tell me what is the difference between GEM SK-760 and WK6SE arrangers?

On GEM web page sk-760 is listed under "Professional Arrangers" and WK6SE is "jus" an arranger.

However, there is a huge difference in prices and the "pro arranger" costs much less than wk6se... Am I missing something here? Any GEM pro can explain the differences between those 2?

Thanks.

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New Yorker