?
Internal transfers into Stern is hard from all schools and I know people who have done it from both.
From what I can tell, from CAS might be easier just because you aren’t locked into what classes to take as much as you are in LSP and can more easily take classes in Stern while still in CAS/clear prereqs/take classes necessary or advantageous to transfer more easily than you can while in LSP. That being said, I know people who have gone from LSP to Stern and been successful in their Stern careers.
(edited bc i initially misread the question)