Of course there is! And the problem is very big! One: It is impossible to change the toilet (unused) in the new house into a kitchen, let alone the old (used) toilet into a kitchen. Can one fire and one water be incompatible? Also, the toilet is a place to discharge garbage, and it has been changed into a kitchen (a place to prepare food). What do you think the consequences will be! ? Two: You said to change the toilet to the storage room on the second floor. I wonder what room is under the storage room. If the rooms below are kitchens, bedrooms, study rooms, Buddhist temples, restaurants, etc. , this is not good!
These are all common sense in Feng Shui.
I wonder for what purpose you want to change the toilet into a kitchen. First, there is a public toilet on the floor of the duplex room 1, which is convenient for guests at home and avoids going to the two toilets upstairs, thus ensuring your privacy. Personally, I don't think it is necessary to change it. Second, from the perspective of feng shui, as long as the toilet is not in a fierce position and not facing the gate, there is no need to change it. Third, if there is a toilet upstairs, it is better to have a toilet downstairs, and nothing else is good.