Your source is correct about the color scheme itself (Regio RAL 6033 and 6034 + RAL 7035 of Bundesbahn - BRD). But of course this waggons and this 234 (232 / ex 132 before) is DDR origin and just repainted (renamed and updated a lot) after 1990. I am pretty sure that 234 304 was modified 1994, I just saw it once in active duty 1996. And also this train is "DB AG" with logo, which means 1994 onwards.

Yeah there's a problem with my sources apparently. I was informed on prop packs as well that Turkish was implemented not on 1986 but around 1992.

Good goob, but 234 304 was colored in this pattern during mid 90's and was the one and only in this color pattern.