RC remote Question (HiT)

Is it possible to switch the character thingy on the remote, so I can use a Thomas remote on James (that was example) or James Remote on Percy?

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I am trying not to hint at what I got, it’s a surprise for BPT

There must be a single component on the 'universal' r/c circuit board that determines the unique signal that is sent to each locomotive.  Whether it's a programmed chip or (more likely) something that produces a signal at a given wavelength, I'm not sure, and I don't think I've ever seen an answer published anywhere.  It sounds like an excellent research project that could be kicked off by someone with two different remotes, without harming either of them. Just dismantle and do a visual inspection.