On FADU recently we have spoken of the effect an increased print size has on contrast. There may be little in it given the small increase here but to eliminate this you can set the enlarger to the 8x10 size and use the 7x5 paper.
I'd be interested in your results if you were to try both the 7x5 and strips from the 8x10 to see what your conclusions are.
Despite being different batches my gut feel is that the difference may be little or nothing but that is all it is - simply gut feel.
Mike
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