In this case they both work but note that there are cases where “via” works and you can’t replace it with “through”. I’m going to Europe via airplane. You can’t say “through” here.

Hi Guitar. Yes they are, you may use either “via” or “through”. They would both have the same meaning in the sentences.

What about this one : I came in by the front door and I came in through the front door. Both work?

In the first sentence, through and via are both correct. In the second sentence, if you are referring to the application, then on Telegram sounds best. If you are referring to the now mostly outdated form of communication, then via or by sound best. I apologise if this makes it seem more complicated, but I am advising what sounds more natural, rather than stating absolute rules..