If I'm buying by best price for a tractor it's LS or NH. Because the NH has a LS motor can I assume I will be able to get engine parts from my NH dealer? They are closer and far better stocked.
You may wish to ask them. In my case, my LS part numbers many times match the Boomer. Bear in mind that is normal maintenance items. Differences that I've seen are in the accessories to which NH has more.
Do you mind me asking how long you've had your LS, what model, and your review of company and tractor? Would you by another? We are looking at a LX4145 and now a Boomer.
It could be a wise thing and peruse the IPLs for both like models that you are considering. In my case XJ2025 VS Boomer 24. Messicks will have NH IPLs. There are parts manuals online for LS as well, though I have the manual.