L33 is a 5.3L & you will probably need to swap the oil pan. Am not sure about accessory location clearance. I'd check the L33 accessory locations for clearance.
Ls1 is a 5.7L, as long as it's from an F-body (Camaro/Firebird; not Corvette), everything fits for sure.
If it were me, I'd take a serious look @ the L33. It's got enough power/torque for the Miata swap, is less expensive & has less miles. Although, I think you could do even better than $2,400.00 for an L33/4L60E. Just check accessory location/clearance & get an F-body oil pan.
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