Could be. The tube # was on the missing larger decal under that Atari sticker.
The Amplifone XY monitor used a M48AAW00X tube.
Maybe someone else will recognize other stickers/markings to be able to give a confirmation.
I have read that the M48AAW00x had a finer dot pitch then an A48* tube would have, though I've never confirmed this via spec sheets. Beyond any difference there, there is no real difference between a raster and vector tube except the yoke. Just match up 90/100 degree, and make sure the pinout and grid voltages match up, and for the most part they will interchange.
Not too surprising that an operator would have re-used the tube if possible. No doubt the HV failed, they raided an old pulled game for a WG 6100, dropped it in where the Amplifone had been getting (likely Star Wars) the game back up and running, then as a plus, reused the tube in a game that had a tube die.