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Nope, your 74 would have had a GR70x15, probably Firestone, but could be a Goodyear. The sidewall could be a blackwall, whitewall or white lettered, depending on what was ordered on the car. The wheel would have been a standard steel rally wheel. The tire shown is a Temp-A-Spare used from 78-82, though it will work if your just looking for a spare.
I have the original spare from my '73. It's a blackwall firestone. Been thinking about getting rid of it. My car isn't original anymore so I don't need to hang onto it.
My 75 tire and wheel are in storage - enough age cracking that I wouldn't trust it. Looks like the original valve stem also. Maybe your 4 year "older" spare is in better shape!