Put a close-up of the trial contacts beside the delivered pads and ask for their identifiers, then ask which set the seller intends you to use for the agreed housing task.
That needs a comparison of the actual holding and release behaviour on your samples, not just matching mounting holes; have they explained why the pad shape changed?
Easier replacement could be useful, but it doesn't answer whether the flat pair suits these parts. Or whether you agreed to the change. Are they offering the original pair as an alternative?
Did they answer either option, Jamie? Interested whether this is moving towards the agreed tooling or another demonstration, because you were still waiting when you last posted.