Look into how easy it is to put on/take off the backhoe and use a 3PH and rear PTO on the LK. Not sure it is best setup for that. It's more of at true TLB, with a tighter fitting backhoe, I think.
The CK backhoe setup will be different, and probably sets farther back off the rear of the tractor. The good part is that on the CKs you don't have to take off the 3PH to put on the backhoe. Most tractors require that you remove the arms before installing the backhoe. Don't know about the LK. If setup right, the CK backhoe will also give you rear remotes that can be used for other things, like log splitter, hydraulic top cylinder, forks. Again, not familiar enough with the LK to know how it's plumbed.
Prices are OK. Maybe a grand high.
HST is much better for loader work. Any rock that the CK can handle, it's bucket will handle too. I've put mine through a lot of work, boulders included and nary a dent. I do have the older style bucket, but I don't think the new one is any lighter duty. Also, the CK comes with a QA bucket, which is nice. Don't think the LK does.
Ask the dealer about these things and get him to show the differences.