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It would certainly appear the thermocouple is not doing it's job, however that does not mean the thermocouple is at fault.

This particular oven suffers badly from rust inside the gas feed pipe from valve to burner, usually this shows itself by a partially blocked jet causing a low flame, this inturn can stop the thermocouple getting hot enough to do it's job.

If that seems possible then the first thing I'd be checking would be the bottom of the pipe behind the jet for an accumulation of rust particles. and the jet itself to make sure their both clear.

As for the question, all thermocouples work exactly the same, therefore any thermocouple that fits correctly at both ends will do the job