Differences in 21FBP22 CRTs

[Tomcomm]

Both my 21FBP22s have no safety glass, so the screen color is due solely to the phosphor. Both are original RCA, not rebuilds. The only numbers I could find were on the pin-caps: the gray screen that's installed has two gray and one green phosphor dots #N JE63619 while the green screen in attic has two green and one bronze phosphor dots #L GA45493. Both are aluminized. Do the cap numbers mean anything? I can slide the yoke over the greeni's broken pin cap so I can repair it with JB Weld then wrap it with thin plastic wrapping tape and try it in the 21CT55. I would still like to know the detailed differences in phosphor between the two.....Tom