2 Battery Boxes - one Discover Dry Cell and one BlueNova Lithium

[LGH]

Hi Guys,
In my Amarok, I have a starter battery which is a normal lead acid, from which I have a 10mm2 cable running to the load bin.
In the load bin the cable splits in parallel and it goes to 2 x national luna battery boxes, each with a with 100Ah Discovery Dry Cell battery, that is charged by the carÂ’s starter battery/alternator. Each battery box powers their own national fridge/freezer and Engel. This setup has worked for years.

The problem now is one Discover Dry Cell battery is dead and the other is good.
I've now replaced the dead battery box with one that I have wired up, which has a Victron DC to DC charger on it and inside the box is a BlueNova Lithium Battery.

My Question?
Can I just replace the dead Dry Cell Box in my setup?
So wired as before, in the load bin the cable splits in parallel and it will go to a National Luna battery box with a with 100Ah Discovery Dry Cell battery
AND
the second split will go to and second battery box, where the Victron DC to DC Charger which will control the charging of it's BlueNova Battery.

Will this setup work and is there a risk for my car?

Thanks