My bike packing / gravel bike has 29" wheels (Salsa Fargo) so I've got a bunch of spare tires and tubes. I just bought another gravel bike which has 700cm wheels (Kona Libre) with much narrower tires. I'm thinking I should still be able to use my 29" tubes as spares for this bike? ( Only the tubes as the tires are much narrower on this bike).

Does that sound reasonable? Are there any watch out for if I can do this?

Thanks