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I think it's obvious that when they first switched, it was hard for D and Orion.
They live in different eras, they have different jobs, different frames, different mentalities.
D-16 is clumsy, he's a few feet taller, the structure of this frame is significantly different from his own and he can fragging transform. He's expected in the Archives and he has no idea what to do, because this is his first time in Archives, but he tries his best. Moreover, D-16 has never seen so much information, and it consumes him. Orion's acquaintances are confused. Orion is chaotic, that's for sure, but this behavior is different from his usual.
At the same time, Orion understands no more than Dee. His T-Cog, or rather T-Cog of this body, is missing, as are T-Cogs of all bots here, and they are almost half the size of the guards. They are treated like this as if they were worth nothing. When it's time for his work shift, Orion nearly destroys the mine, as it's the first time he's done something like that. This causes problems, but he's eventually sent to the medbay, because D-16 has always been a diligent miner. Perhaps the reason for his behavior is that he's been working like crazy for the last few cycles, the other miners think.
An AU where D and Orion live in different time periods. Orion is a chaotic archivist who lives in the midst of a war between the Primes and the Quintessons. While Dee is an ordinary cogless miner who live under the rule of Sentinel. They were not destined to meet until one day while recharging they began to switch bodies.