MHZ2160BH G1 vs MHZ2160BH G2 - what's the difference?

[DataStudio]

Hello guys,
want to ask You a question related to MHZ2160BH disk, there is a G1 and G2 version.
Does anybody know if PCB in these two models are interchangeable ?
I've got MHZ2160BH G1, it's hard to find the exact donor with matching firmware, I found the G2 version with the same firmware and I am curious if can I use its PCB to verify if the damage is related to PCB?

By the way, a propos the MHZ2160BH G2 version, please take a look to the picture below.
There is a weird nomenclature on the label - I marked it in red.

Thanks in advance for reply.

[dmarques]

I'm not sure if that's related to manufacturer or country, but I never saw that.