No LDDA 9,53 will work on a SP1 core. You will not be able to take advantage of all of the new features in LDDA 9.53 until you do upgrade to SP2, the ones that are SP2 specific are noted in the readme found hereNot authorized to view the specified document 30785. No if you apply SP2 you should not have to reinstall LDDA 9.53.
Jason