No special reason why they should be. A particular ball maybe, since most companies publicize ranges of hardness, usually 73 - 75 or 74 - 77, or thereabouts.
Pearls, theoretically, have no more hardness than solids (resin or particle) BUT they are usually less elastic than solids, because their main objective is to go longer. So they have less surface area in contact with the lane than solid balls do. I have had to assume that this relationship is the same for solid resin with respect to pearlized resins, as it is for solid particles with respect to pearlized particles.
That said, from what I have read here on ballreviews, over the past several years, when pearls are sanded to the same finish as their respective solids, the pearlized balls seem to hook more than the solids. I am not sure what the reason for this is. But it has been noted by many people. (Don't kill the messenger.
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