Ticker symbols from investpy differ of the ones on the investing.com

[FBisschop]

Dear all,
First of all, thank you very much for this Wonderfull tool. it works flawlessly.
however I ran into something I do not understand. For some stocks/companies the ticker symbol that is used in investpy is different from the one used by the company and exchanges.
For instance: Euronext Amsterdam, a company called Fugro is not FUG but FUGRc. On investing.com FUGR is used.
Frankfurt exchange: Deutsche Telekom uses DTE. In investpy DTEGc.

Questions:

• although the symbol might differ, are these symbols referring to the same stock. In other words, the data that I receive, are they the same as from the correct stock?
• what is the reason for this difference?

Thank you

Francois