Hello Antonio,
Thank you for your Hi-Res picture ! It is really very very better.
As say Belochka, it is sure that the two photos seem to be very different (no door, but explained by Penny some threads ago, length of walls differents) but i carry on thinking it's the same room :
Ipatiev House has a lot of 'candidats' room other than dining-room :
1) rooms of the basement ? : They were used by servants or used by Ipatiev for his work. Then, rooms couln't be so elegants with this complexe cornice and big dimensions. Sure this room wasn't in Ipatiev House basement but at the first level
2) If we examine Gilliard map, we see, the fireplace could only be at this place (added in red) and the photo taken with red arrow direction (we see no windows and the door
3) It's not stupid to think it could have a fireplace on this wall because if the photo has been taken with "red arrow" point of view, the door at the left of the fireplace open to NAOTMAA room.
Now, if we examine the photo of OTMAA room, the photo hase been taken with the second red arrow point of view. In fact, the photo shows the only closed wall of room (all other walls have doors or window). So, the little stove at the right (framed in red) is closer to the fireplace of the dinning room. it's logical the two stoves are very closer because they surely share the same pipe.
The only difficulty is to understand in the 'recent' photo of the dining room how they could block the door to OTMAA room because it was the only one which let people enter NAOTMAA rooms...
Now, why the vertical dimension of wall seems to be so different, it's surely because the older photo with furnitures has been taken in a normal way with camera hold by people then 1m 70 from ground
The second has been taken some time before house destruction and I red that floor of the house has been removed (the floor on the second photo looks strange in the bottom left corner)
maybe the photo has been taken from ground room of the house with wall removed. then, the vertical dimensions seems very differents...
to reply to Antonio_P.Caballer, i have no ideas of the fath of the furnitures of the room. Maybe Ipatiev bring them in other place when he left this house after White Army defeated