Vintage Rlectron Tubes Zenith Realistic Lifetime Tube for Radio TV Television

Lot of 2 Vintage electron tubes. Both are in a Realistic Lifetime Tube box, but one of the tubes is a Zenith tube. They appear to be the same size. The Realistic Lifetime Tube has the same part number as stated on the box, which is 6Z10 6J10. It states Japan on it, which is where it was made. The Zenith tube states it was made in the USA. I don't know if the tubes work, but I have a feeling they do as I bought several electron tubes from the same estate. The boxes make for a cool decorative piece.