be or have

[allthewayanime]

I know that this is right: They are the same height.
But is it possible to say: They have the same height.
If so, what's the difference?

[SoothingDave]

Only the first is possible if talking about people.

The second is possible, but not as natural, if talking about an object. Like, "There should be no problem installing the new refrigerator. Both it and the old one have the same height."

[allthewayanime]

If I am talking about pets should I use the first one?

[SoothingDave]

I would.

[allthewayanime]

Thank you. One last thing when we tell others our weight, height etc. do I have to use the verb to be or the verb to have?

e.g. I have 56 kg or I am 56 kg.

[konungursvia]

If we say "they have the same height" of two people, we mean they have the same height measurement or answer on an assignment, e.g. measuring the height of a tower with trigonometry. The height of the actual people requires "to be."

[emsr2d2]

Thank you. One last thing when we tell others our weight, height etc. do I have to use the verb to be or the verb to have?

e.g. I have 56 kg or I am 56 kg.

I would use neither. I would say "I weigh 56kg".