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FB is the gasket style CRT part number and FJ is the bonded.
I have not been able to find envelope differences between bonded and gasketed round color CRTs. I have swapped gasketed safety glass onto bonded tubes post cataract removal (either do to safety glass scratches or cracking of the safety glass during cataract removal) successfully. It is absolutely doable. The new safety glass may add a fraction of an inch to CRT dimensions so be careful not to overtighten mounting screws.
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