MT5 strategy tester downloads historical data directly from the broker's server.
If you use every tick based on real ticks modelling and at the backtest results you see a 99-100% quality when your test finishes, this is as close as it can get to real trading results.
The different results you see in another broker may have to do with the different trading conditions or type of account used, depending also on the strategy that your EA uses.
The fact that you are using historical data with your second broker doesn't mean much, if that data are not used with an every tick based on real ticks modelling and don't give a 99-100% quality result.
why the results are different when using my own broker? Any help would be greatly appreciated. Thanks!
The initial data for backtests is the history of quotes. This data can be very different for different brokers.
To select the most profitable broker, you need to study their history of quotes. There are various tools that allow you to find such a broker.
For example, this one.

- Free trading apps
- Over 8,000 signals for copying
- Economic news for exploring financial markets
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Hey everyone,
Does anyone know which broker is the closest to MT5 demo servers and why the results are different when using my own broker? Any help would be greatly appreciated. Thanks!
I'm new to this so pardon me if my question doesn't make sense.