Yes, you can move part from Mini to L15 and also to the L14, with minor caveats.
The Mini has two SODIMM sockets, while the L15 just has one.
The Mini and the L15 can have a 2.5" SSD/harddisk while the L14 just has M.2 slots, no 2.5" (we cut that out to save space, it feels like a legacy thing anyway).
Hope that helps!
Cheers
nicole