No, that is only based on my own (exhaustive!) research. Some of the European events are still only a few years old, so have tweaks every now and then, but Maastricht has completely changed the bike course every year in its three year history. I have the bike course distances recorded at:

IRONMAN Lanzarote - 179.5 km
IRONMAN France - 173.4 km (!)
IRONMAN Austria - 176.9 km
IRONMAN Frankfurt - 180.4 km
IRONMAN UK - 180.2 km
IRONMAN Switzerland - 178.1 km
IRONMAN Hamburg - 182.1 km
IRONMAN Maastricht - 177.0 km
IRONMAN Sweden - 180.7 km
IRONMAN Copenhagen - 179.7 km
IRONMAN Vichy - 175.9 km
IRONMAN Wales - 181.4 km
IRONMAN Barcelona - 180.2 km

All of these are the courses for the most recent event, with the exception of Frankfurt, which had diversion for this year only due to construction works. They're are based on the official published routes, Strava stalking and Google Maps plotting, so they should be reasonably accurate. In the case of IM Lanzarote and Copenhagen, they're probably within the margin of error, but others are clearly short.

The published routes for the new IM Italy event this year and IM Norway next year both look to be short too (178 and 175 km respectively); details for IM Tallinn are scarce at the moment.

Obviously, distance is only one factor though; IM UK and IM Barcelona are apparently exactly the same distance, but again, looking at median finishing times for the last few years, Barcelona is a full 90(!) minutes faster for the bike leg alone.