Hi @livfe,
Based on the fact that the lower case assembly have different manufacturer's part numbers I don't think that they are interchangeable..
What is the full model number of the X441 laptop that you're looking at?
Looking at the part numbers for the lower case assembly they are different for the X401A-1A and the X441 models, which are even different between each variant.
Presumably there must be some difference otherwise you would think that they would have the same part number.
Here are just a few examples to show what I mean
X401A-1A p/n = 13GN3O1AP010-2
X441BA p/n = 90NB0I01-R7D010
X441MA-1A p/n = 90NB0H41-R7D010
X441MA-3G p/n = 90NB0H43-R7D010