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Will there be any difference in stiffness between CX rays and lasers?
not really
Do spokes even effect stiffness?
yes but I guess you want a lightweight build.
Is it a track hub rear? what is the flange spacing? Symmetrical?
standard answer: thicker spokes on rear drive side (/drivesides) maybe cx sprint, and then cx ray on the rest
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Will there be any difference in stiffness between CX rays and lasers?
No. The stiffness of the spoke will depend on the Young's modulus of the material used and the cross-sectional area of the spoke. All steels have essentially the same Young's modulus (particularly as all steel spokes I'm aware of are made from 18/8 stainless steel or similar) so the only thing that will change in terms of spoke stiffness is the cross-sectional area. CX-Rays are just flattened Lasers, so will have the same area in cross section. If you want stiffer spokes then you're going to need either a different material (impractical) or a chunkier spoke (like a CX Sprint rather than CX-Rays).
Oh, and I'd recommend not lacing the front wheel radially if you're using Mack hubs. 2 cross front and rear.
compared to what?
cx rays are squashed laser spokes (2mm - 1.5mm - 2mm) so are light
What is the flange spacing on the hubs?