sorry for this issue may you can try this
The simple Solution is, add two Same Section(A & B) with different images.
A for desktop B for Mobile.
Hide A for Mobile and Hide B for Desktop.
It can be done using CSS media queries.
Hope it helps.
if you need different slideshow image may some way add two section or if not able to code please let me know
please share your slideshow code so i will update
Ok here's the code . Thank you!
can you please share store url