2011 Alhambra NOx sensor needs replacing - can we use 03L & O4L prefixed versions?

Aug 18, 2021
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Morning all I need to replace the NOx sensor having already replaced everything in line from the reluctant tank, pump, heater, ad blue sensor, level sensor, eval unit etc.
Looking online, I’m not going to replace with a new part as its Blummin expensive, so I plan to buy a lightly used one, carefully. My question is, can I use both the 03L AND 04L versions?
ie: is the 04L an updated version of 03L?
thanks in advance AL