I think it means that this is ok:-
(Ignore the bold for the moment, it's not part of the instructions..)
R sp CARLISLE
L sp CARLISLE
SO @ RAB sp CARLISLE
R sp CARLISLE
but, in order to pick a nicer route you divert off the main/obvious road for Carlisle, to go somewhere else you shouldn't put it in caps, i.e.
R sp Carlisle
L sp Carlisle
1st Exit @ RAB sp Footown
1st R no sp
L sp CARLISLE
R sp CARLISLE
The instructions in bold are the same between the two sets. By not putting it in caps you're essentially highlighting that you don't follow the signposted route all the way to that place name.
Even if both sets of instructions go through Wibbleton and Wobbleton after that find R sp CARLISLE, the signposts should still be telling you to continue on this same road until you do get to Carlisle.