here is the info on the 2020 model (on right)
http://www.jetbeamlight.com/products_show312.html
and the 2019 model (on left)
http://www.jetbeamlight.com/products_show299.html
pic (not to scale) is a link to more info on the 3 versions of RRT-01
no one has the 2020 model in hand yet, so we dont know the size of the lanyard slots… to my eye, they look larger than a 1.5 x 6mm tritium, pure speculation…
the 2020 is the first to offer 219c, and tailswitch