Thanks in advance
Do you not have a Saturn with you, or ordering is also not an option?
If it's the same price, order on the internet. Then you have a right of withdrawal.
Questions, since both are the same company, maybe something works.
Just ask at the media market, most of them go along with "competitive markets" or you get the price guarantee through the back door. But see beforehand / check whether they are really "the same", there are often differences in the details of software or hardware such as display type or battery size.
The point is if you shop regularly at MM and even have an MM customer number, so you are more likely to be a "regular customer" than at GIG "bargain hunter".
https://faq.mediamarkt.de/app/answers/detail/a_id/12294/~/gibt-es-bei-mediamarkt-eine-tiefpreisgarantie%3F