Hello Anthony,
Thank you for contacting SanDisk Technical Support. It is our goal to make sure you have all the resources you need to get the most from your product.
Yes the one with the ESP was produce earlier, it was just label differences, all of the Extreme III Compact Flash cards has the same speed.
If applicable, please take time to register your other product. Please provide the place and date of purchase as well as the part number of the device.
Should you have further concerns, please do not hesitate to reply to this message or send another inquiry at
support@sandisk.com.
So according to sandisk, Lee and I have the same speed with our Extreme III's.