Valve springs for 09 cam in 07 head

I found a near new stock 09 cam, which i'm going to install in my low hours stock 07.  I've heard the 07 ex. valves are .5mm thicker than the 09, so i imagine slightly heavier. Just wonder what would be the best springs, new 07's, new 09's or stiffer aftermarket springs.

Edited by bucket list

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