So you think with an update file from the TH2832 you will get 20Hz..200khz in 15025 steps(instead 50Hz..100khz in 34 steps), a dc bias adjustment(instead of none) and the ALC (automatic level control) circuit(insted of none)..
Hard to believe but not impossible.
Why would that be hard to believe? If we can't find a difference in hardware, there's only one place left...
Also, look at popular modern test gear:
SDM3045X(4.5digits, 66,000 counts) identical hardware to SDM3055X-E (5.5 digits, 240,000 counts); Every modern scope with the "upgrades" and "options" etc.;
AWGs from Siglent, UNI-T, etc. very often identical hardware within the same line, only separated by firmware or options or some other soft limitation.
I'd say it's more believable than not. 😉