I think they were all built with just the double horizontal handrails.
At some point, they were all equipped with two vertical and two right-angled frames on the smokebox doors. These were meant solely for the purpose of mounting ceremonial shields, most notably for the tour of the Papal Nuncio and other Vatican officials, when the engines bore shields carrying the Vatican flag and emblems. There are photographs of all three 800s lined up on shed at Cork carrying these shields.
Subsequently, photos of 801 and 802 in their subsequent years of service show them still carrying these mounting frames; it may be safe to say that, during their CIE period, they were never removed until the engines were finally cut-up. When 800 herself was set aside at Thurles, photos show that the frames had been removed from her smokebox door, and she thus had reverted to the original setup of the double horizontal door rails.
I don't remember IRM specifically stating which of their 800 class models will have mounting frames as standard, or whether the frames will be provided as separate parts for you to fit, but I think it may be surmised that 801 and 802 in late CIE livery will have them.