Presumably the new streamer board will need to connect both from a power and a signal point of view to the internals of the Devialet, the infrastructure to make these connections is likely to be part of the PRO upgrades therefore the chances of it fitting to the older boards is probably zero or less.
UK kit - Technics SP10 - Technics EPA-501 - AT33SA - NUC5i3 - W10 - Roonserver - Roon AIR - Devialet 1000 Pro CI - Blue Jeans Speaker Cable (0.5 metre each side) - Magico S5
Spain kit - NUC7i5 - W10 - Roonserver - Roon AIR - Devialet D250 Pro CI - Blue Jeans Speaker Cable - Ergo IX speakers
Spain kit - NUC7i5 - W10 - Roonserver - Roon AIR - Devialet D250 Pro CI - Blue Jeans Speaker Cable - Ergo IX speakers