if you need backwards compat with old RBLT mods, which arent SBLT ready, just use RAIDWW2-BeardLib it comes with full support for RaidBLT's mod.xml file. (and will also allow you to use any future mods, that might require BeardLib's extra features, on top of SBLT, obv.)!
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Raid WW2 BLT
The BLT hook from payday 2 in Raid WW2!
What has changed?
mod.xml & Modules
Instead of mod.txt(json) you should now use mod.xml.
The xml schema is basically adopted from BeardLib, but implemented very differently, and therefore has it's own documentation.
As of now there are 7 Modules, to be used inside of this xml: Classes, Hooks, Keybinds, Localization, Menu, Option and Updates, the updates module unlike in pd2's BLT supports both paydaymods and (dropped in 1.70) modworkshop for updating.