it depends;-)
– on your fitness level
– what you trained before you start the 24 week plan
– on your goals
– on how hard you climb
– if you want to change some workouts of the plan to climbing (maybe the core!?)
…and more!

it’s a very individual question, but if you want a short answer: if you increase the stress on one side you probably have to reduce it somewhere else. So if the training from the plan is more than you have been doing, you should probably scale back on climbing. But as I wrote above: it depends!

hope that helps!?
Thomas

I don’t want to encourage risk of overtraining, but my experience of being at that level of activity was climbing (especially at the gym) felt more like a stretch than a high stressor. (The general wisdom was always that it really mostly depended on muscles from your elbow to your fingertips, so not something that taxes the aerobic or other central systems very much.)
To that extent that gym climbing exercises your core muscles (say, with overhangs and the like), I’d just say those muscles have incredible endurance (see guy who finished the Vasaloppet ski marathon just double-poling).