If you made the strips using the Step Wedge then that's fine, you can use them as is because the exposure correction does not affect the range of contrast shown by the step wedge when using that method.

If you used the alternative method described in section 5.4 of the Calibration Manual, I'd advise you to make new ones. The ones you already made can be used but it's rather a tricky calculation to remove the effects of any adjustments already in PAP4.