I would think that a common technique sheet could be used if the machines are VERY similar. That just makes sense. However, you may encounter questions from an auditor if you used one machine for qualification and then were using the other machine during an audit. You might protect yourself by clearly stating in your technique sheets, and maybe other documents, that the machines may be interchanged. Something else that might help is prepare set up in one machine and run saturation curves etc and then transfer the fixtures to the other machine and run another saturation curve. Compare the results and make your own conclusions.
