You will definitely have a cycle tho it is hard to say how big ...
But by siphioning out the water into bins and then scooping the sand out and into the new tank along with the LR
,then pumping the water back in you should see a bit of a cycle but not huge... I would say that are looking at probably another 2-4 weeks of a cycle... tho there is a chance you wont see one at all... When I change our tanks it was settled down with in 48 hours .