No, Panda Clear uses a black spring and you're confusing cn with peak force.
Black actuation force is 60cn, Blue 50cn, and Brown/Red have 45cn. I don't think anyone has a solid number for cn on Korean Springs, but it's probably between 40 and 55 depending on which spring (55g, 62g, 65g). Blacks have 80g peak force, while Reds, Browns, and Blues have ~60g peak force, meaning 62g Korean Spring is about as close as you can get to cherry springs.
Yes it was a good deal, and I'd honestly stick with your plan of only using the stem. The problem with 55g springs and even red/brown/blue springs (~60g), is that sometimes they can be too light to reset reliably. Most people who have done ergo clears in the past, using red/brown/blue springs, have gone through a lot of them and hand picked the ones that were able to reset reliably. It's for this reason I recommend 62g, but you can do whatever you like
Edit - GH name is Jocelyn