Hi,
They are directly replaceable. The have also the same mask set and errata list. The only difference is that ZVLA has defined, tested a and guaranteed also Analog Comparator Module (ACMP) and Programmable Gain Amplifier (PGA).
If you use these modules at ZVLA then they are not allowed to be used on ZVL device. If you use them then quality is not guaranteed and you loss warranty.
Best regards,
Ladislav