The goal is to get the heading.
But as I have read in the forum that the heading cannot be computed by the Reach itself, the PC will be connected by USB to both modules and compute the heading.
It is not possible to pass the base corrections from one rover to another.
However, you can send the corrections from the base to the two Rovers simultaneously and then calculate the heading on PC. You can do that with two LoRa modules or use the Emlid caster if your rovers have an access to the Internet.