There is a canon storyline to TOR but, for the Mandalorians at least, it's still a bit convoluted and unclear. That is why we will recgonize named canon characters from TOR such as Shae Viszla but, likely won't have a CRL for the era itself.
If you watch the video's and look at the images from the standpoint of critique rather than fanboy squeeeeeeeeeeee, you see tons of continuity issues in design.
For example, a direct quote about the GAR during the Clone Wars was, the galaxy had never seen an army like it. The Republic Army in TOR look like Clone Trooper from armor design to weapons load. Some images of the Mando's look like an armor mess from Early to Modern in design. The humanoid Cad Bane smuggler guy everyone is so excited about is flying a YT class shipp that looks almost exactly like the Millenium Falcon. There are weapons galore that do not seem to match the era etc.
Basically, I give GL kudo's for making his money and making it recognizable to everyone by doing whatever he wanted and putting things that are inappropriate for their timeline into the game.. Even casual fans will recgonize the Darth maul Sith, the Millenium Falcon and the Stormtroopers in the game and will be drawn to it. For me, as a fan of continuity and not a fam of online gaming, I see it as an "UNGH". LOL
That's why I recommend using KOTOR for reference. You may even be able to wookieepedia some weapons from that era. The video games KOTOR would be good references as well and the weapons are much better defined.