With those settings in Overwatch, you are doing an equivalent to 0% Monitor Match. So plug in all your numbers for Overwatch hipfire, select convert to Monitor Distance and 0% match, then go through each aim and scope for PUBG. PUBG calculations will be a bit better when they release the next version with an FOV slider.
Note that 3rd person views will to some degree always feel different than 1st person, even though the sensitivity is the same.
Targeting is holding right mouse button, so it's basically the same as hipfire but with a locked view. Scoping is pretty close to 1.25x