No, I mean reportedly Series X and Lockhart use different chip designs completely. There is no binning happening to recover Series X chips for use in Lockhart. Both have redundancy built in, though. There are 56 physical CUs in the XSX GPU, for example, but only 52 are active to allow for defects.
Lockhart also uses a different memory bus and motherboard so there is actually a cost and complication in managing two distinct production lines and trying to anticipate relative demand.