Jack Reacher (Lee Child) & Repairman Jack (F Paul Wilson)

I love both these characters and am reading Wilson’s Legacy at the moment.

In the comments section, Child praises Wilson’s RJ, which I think is really neat since the characters are similar (IMO).

Was there ever a time when that wasn’t the case, and they were pissed at each other because of that similarity?

Also, how does RJ tie in with The Adversary Cycle (which begins with The Keep)? Or am I mistaken? I am thinking of RJ’s experiences with the Rakoshi.

Thanks for your help.

Quasi