One hive hefts like a rock, the other's light — can I move a frame of stores across, or just feed the light one?

Yorkshire, first year, two hives side by side. Same apiary, same forage, same treatment, but hive one is so heavy I can barely tilt it and hive two comes up easily with one hand. Both look healthy, both have bees at the entrance on mild days, and hive two has a young queen from a supersedure in August, so I assume it's just smaller and started later. The obvious thought: hive one clearly has more than it needs. Can I take a full frame of sealed stores out of the heavy one and put it in the light one? It feels tidy, and it uses honey the bees made rather than sugar I buy. But I can hear the objections. Am I risking moving disease between colonies, even in the same apiary? Am I taking the margin away from the hive that's actually going to need it in March? And it's 11°C here at best — is opening two hives to do a swap worth the disturbance when a bucket of syrup or a slab of fondant doesn't need me to open anything much at all? What would you actually do with a week of decent weather forecast?