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Everything about different bullets (of the same weight) is different but the weight. Not just crimp groove position, but diameter (44 mag bullets come in .429, .4295, .430 in jacketed, and even larger in cast), ogive, bearing surface, jacket thickness and ductility, core hardness, etc.
The point is, these little differences don't amount to enough of a difference to adversely affect pressures, as long as you . . . .
"start 10% below max and work up, looking closely for pressure signs."
They could make a catastrophic difference if someone was careless enough to start at max and hope for the best.
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