The quotes/data/prices are not synchronize between the brokers because the brokers may have the different sources for that so it is the normal situation.
So, it must be difference between price on same currency and same time but two different brokers (slightly but different).
Because the trading accounts, money for trading, the price on the chart (quotation), and time of the price on the chart, the symbols to trade and so on -
all of the them are related to the broker only.
It means that brokers may have the different quotes/data (and the quotes/data are not the same for different brokers).
It may be same situation with demo and live/real account: different quotes.
Forum on trading, automated trading systems and testing trading strategies
Sergey Golubev, 2019.11.19 06:12
The data/quotes (and the quality of the data/quotes) are related to the brokers only.
Many traders are selecting the broker based on the quality of the data the broker is proposing (the data/quotes may be slightly different from one broker to an other one within one trading platform for example).
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Forum on trading, automated trading systems and testing trading strategies
Every tick VS Every tick based on real ticks AND latency on StrategyTester (backtesting)
Sergey Golubev, 2017.04.25 18:24
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Of course, if you are planning to trade EA with some broker so you will use broker's data/tick. If we do not like their data so we may change the broker with more good data.
And the data/ticks are not unified for the different brokers ... For example, there are some indicators (iTrend for Brainwashing system for example) which are showing the different results with the different brokers.
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If some person will tell me the following: "I have profitable EA."
I will ask him: "Which broker for" (is it profitable for which broker?)
If he will reply: "Any broker" so he is using martingale strategy, or he is trading on W1 timeframe with the trades opened once per half a year for example (because the performance of EA should not be same with differet brokers and/or trading accounts).
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