Need Help Mimaki UJF-3042FX printhead

Hi guys!

I'm thinking about buying small uv flatbed printer. I've come accross one Mimaki UJF-3042FX at fair price, but two printheads needs to be replaced. Because of physical damage, there is a gap in missing nozzles about 5mm. So I was searching for printheads and found 2 versions:

Original Mimaki
https://www.digiprint-supplies.com/en/ujf-3042-head-unit-assy-m010010-phmi7982.html?category=43
and
Ricoh
https://www.digiprint-supplies.com/en/ujf-3042-gen4-7pl-printhead.html?category=43

So I'm asking you is this cheaper one (Ricoh) good choice, or is there some difference between those two heads that I'm not aware of?
Is there any step-by-step guide for replacing heads on 3042FX? Maybe some kind of service instructions.
I have been replacing head on my Roland SP-540V, and it turned fine.

Thanks.

 

I'm aware of that, it's just matter of budget.
Print quality at current status isn't as bad as you would think considering head damage. Color prints just fine with noticable lines just on solid colors. White is more tricky because on black substrate turns out grey, not white. Low opaque