The manual is your friend!

"Compare historical price data. Print out several candles with the same time stamps and check. Have they the same OHLC prices? Are they from ask, bid, or trade prices? Is the timestamp from the open, the center, or the close of the bar? UTC or a local time zone? When using tick data, does it contain the same quotes? Candles with different price types or time zones will produce different results."

Some platforms like MT4 use a local time zone instead of UTC, so their results are always different dependent on location. You must set Zorro to the same time zone for simulating this.

Forex prices are anyway different with any broker.