The match value of any device font is guaranteed to be unique only for the current device. If you associate the presentation space with a different device context, any logical fonts that also are device fonts are no longer available. On the new device, the match number could identify a different device font (which may not be suitable) or no font at all. Therefore, you should redefine a logical font and select it as the current font if you reassociate the presentation space when the current font is a device font. Otherwise, the default font is used.
If you do not intend to use the font on the new device, however, you need not redefine it. You will be able to continue using the font if you reassociate the presentation space with the original device context.
Any generic fonts can continue to be used after the presentation space is reassociated if they are suitable for the new device. An image font, for example, can be used only on devices that are all-points addressable.