Although I would like to reuse some of the maps from the SSD Bhaal, as there is one which is being used on the Bhaal as well.
I'd advise against that. UVmapping something to an existing texture made for something else very rarely looks good due to distortion/space inefficiency just to make the differeing geometry fit. It's much better to just UVmap it in a way that is space efficient and non-distored for the model itself, and then make it similar via texture...
Even if it is the exact same geometry (say, a turret), you should still copy the segment of the Bhaal's texture you want to use onto say, a corner the Raguel's own texture.
Don't make it reference the Bhaal's texture, because it'd force the game engine to load the Bhaal's texture AND the Raguel's texture every time the Raguel appers in a mission. The Bhaal's textures are high-resolution and large, and forcing the game to hold onto it in memory for only a small portion that will be used on the Raguel is just horribly wasteful of system resources, since over 90% of the texture held in memory would be wasted.
It'd also force any mod that wants to use the Raguel to also include the Bhaal's texture regardless of whether the Bhaal itself is used, which cause modpack bloat. The only way in which this cross-mapping would be acceptable (and actually more efficient) is if the Raguel always and only
appears with the Bhaal in every mission, but even then it's horrible since you're limiting your design space, and that of everyone else that may wish to use your model.
Just don't do it.