Do you still have any of the factory sounds on the SD card?
If so, they are different between firmwares - this is all 2.5 I think

or they are downloadable from Bastl here to compare:

https://f002.backblazeb2.com/file/bastl-zip-files/mg-bank-2.5.zip

I am not sure if there is any other way or not?

Also: that video is August 2016, so if you bought much before that, maybe you do?
Also: I think maybe the colours changed when 2.5 came out, so Bastl might be able to tell you themselves from the colour.

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