I was too lazy for that. I replaced one wheel at a time by unbolting it, lifting the corner enough to slide the replacement in and then bolted the new one in place. Worked my way around the cabinet.
I was able to check the replacement casters against the floor model though. Since you bought the floor display you could pull one of them off of yours and leave it resting on a couple of 2x4s or something while you take it to the store to find the new ones. As I recall the ones I got are a bit larger diameter but had a 300(?)lb rating which was one of their more robust ones. Urethane wheels too I think.
Not sure it’s faster or easier than emptying everything and putting it on its side or back, but it seemed to be to my lazy self